Exxentric
Exxentric is a Swedish specialty equipment company founded in 2011 that designs iso-inertial flywheel training systems (kBox, kPulley, SingleExx) for professional sports teams, rehabilitation clinics, and home fitness consumers worldwide. It sells hardware direct-to-consumer, through channel partners across 65+ countries, and into elite sports franchises.
- Company typePrivate
- Founded2011
- HeadquartersStockholm, Sweden
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What Exxentric does
Exxentric AB is a Swedish specialty equipment company founded in 2011 that designs and manufactures iso-inertial flywheel training systems for strength, power, and rehabilitation use. Its core technology replaces gravity-dependent weights with inertia-based flywheel resistance, producing variable resistance curves that auto-adjust to user effort within each rep and uniquely enable eccentric overload — applying larger forces in the eccentric phase than concentric — a capability not achievable with conventional weights. The product portfolio includes the kBox platform (Active, Lite, Pro, Medical, and Rack variants), the kPulley horizontal system (Go, Go+, Pro), and the SingleExx dedicated leg machines (LegExx, LegFlexx), complemented by accessories and the kMeter Bluetooth performance sensor that streams power and force data to the Exxentric App.
The company operates a multi-channel go-to-market model combining direct e-commerce (hardware ASPs ranging roughly $1,815–$7,490), enterprise field sales into professional sports organizations (NHL, NBA, NFL, top European football clubs, Olympic and combat-sport athletes), a regional sales partner network across 65+ countries, in-person certification courses at its Stockholm HQ, and a nascent subscription/rental business (Club Exxentric in Sweden and app tiers up to $24.99/month for coaches managing 99 athletes). Customer concentration spans professional sports teams, rehabilitation clinics (via the CE-marked Class 1 Medical Device kBox Medical), and direct-to-consumer home fitness buyers, with revenue generated primarily from hardware sales and an emerging recurring software and services layer.
Exxentric is founder-owned (Fredrik Correa, M.D. and Mårten Fredriksson), headquartered in Bromma, Stockholm, with a wholly-owned US subsidiary (Exxentric North America, Inc., Portland, OR) and no disclosed external institutional funding beyond a 2018 Tillvaxtverket grant. The company derives significant scientific and brand credibility from collaborations with the Karolinska Institutet, the European and Canadian Space Agencies, and NASA — the kBox technology informed NASA's Artemis II Flywheel Device for astronaut muscle and bone preservation in microgravity.
Exxentric firmographics
Firmographics- Name
- Exxentric
- Legal name
- Exxentric AB
- Website
- https://exxentric.com
- Company type
- Private
- Founded year
- 2011
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Exxentric is a Swedish specialty equipment company founded in 2011 that designs iso-inertial flywheel training systems (kBox, kPulley, SingleExx) for professional sports teams, rehabilitation clinics, and home fitness consumers worldwide. It sells hardware direct-to-consumer, through channel partners across 65+ countries, and into elite sports franchises.
- Ownership category
- akta.pro rank
Exxentric industry classification
Industry- Product category
- Strength Training Equipment
- NAICS
- Electromedical and Electrotherapeutic Apparatus Manufacturing (334510), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451)
- SIC
- Electromedical & Electrotherapeutic Apparatus (3845), Orthopedic, Prosthetic & Surgical Appliances & Supplies (3842)
- akta.pro primary industry
- Home Gym Systems & Smart Fitness Equipment Retail (Connected Mirrors, Smart Bikes, All-in-One Gyms) (CRAMADAG)
- akta.pro secondary industries
- Strength Training Equipment Retail (Racks, Benches, Barbells, Plates) (CRAMADAB), Sports & Active Rehabilitation Devices (Adaptive Sports Mobility, Performance Prosthetics) (HLAHAMAJ), Online/Remote Personal Training & Programming (HSADAAAM), Fitness, Exercise & Gym Equipment Distribution (CRAOAJAG)
Keywords
Where Exxentric is headquartered
LocationHeadquarters
- HQ city
- Stockholm
- HQ country
- Sweden
- HQ region
- Europe
Offices2 records
Markets served
Exxentric business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Hardware Sales (Flywheel Training Equipment): Direct e-commerce sales of flywheel training devices (kBox, kPulley, SingleExx) and accessories (flywheels, grips, bars, belts, harnesses) to professional sports teams, rehabilitation clinics, commercial gyms, and home fitness consumers worldwide.
- Club Exxentric Subscription: Monthly rental subscription for kBox Active system in Sweden with included accessories, app access, and coaching content. 12-month plan at 499 SEK/month or month-to-month at 699 SEK/month. Eligible for friskvårdsbidrag (wellness benefit) reimbursement up to 80%.
- Exxentric App Subscriptions: Premium subscription tiers for coaching and tracking features: Premium ($9.99/month or $99.99/year) for coaching up to 5 users, Professional ($24.99/month or $249.99/year) for coaching up to 99 users with Academy access.
- Training Courses and Certifications: In-person flywheel training courses including Sport Performance, Trainer Course (Level 2), and Master Course (Level 3) held at Exxentric HQ in Stockholm for coaches, physiotherapists, and fitness professionals.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | kBox Active System - Entry-level home gym bundle |
| One time/ perpetual license | Pay-as-you-go | kBox Core System - Standard platform for hobby athletes |
| One time/ perpetual license | Pay-as-you-go | kBox Advanced System - Most popular for varied training |
| One time/ perpetual license | Pay-as-you-go | kBox Ultimate System - Complete professional setup |
| One time/ perpetual license | Pay-as-you-go | kPulley Core System - Horizontal training starter |
| One time/ perpetual license | Pay-as-you-go | kPulley Advanced System - Extended horizontal training |
| One time/ perpetual license | Pay-as-you-go | kPulley Ultimate System - Full horizontal training suite |
| One time/ perpetual license | Pay-as-you-go | kPulley Go+ - Portable with auto retract |
| One time/ perpetual license | Pay-as-you-go | kPulley Pro - Elite training and facility use |
| One time/ perpetual license | Pay-as-you-go | LegExx - Quadriceps flywheel machine |
| One time/ perpetual license | Pay-as-you-go | LegFlexx - Hamstring flywheel machine |
| Unit Pricing | Pay-as-you-go | Accessories - Individual components |
| One time/ perpetual license | Pay-as-you-go | kBox Medical System - CE medical device for rehabilitation |
| Freemium | Pay-as-you-go | App Basic - Free performance tracking |
| Subscription | Monthly | App Premium - Enhanced coaching subscription |
| Subscription | Monthly | App Professional - Full coaching platform |
| Subscription | Monthly | Club Exxentric - kBox Active rental subscription |
Go-to-market motion5 records
Distribution channels5 records
Marketing channels9 records
Exxentric product offering
Product offeringCore offering
Exxentric designs, manufactures, and sells iso-inertial flywheel-based strength and conditioning equipment — including the kBox vertical platform, kPulley horizontal system, and SingleExx leg machines — that uses inertia-driven variable resistance instead of gravity to enable eccentric overload training across more than 70 exercises per device. The hardware is sold direct-to-consumer via e-commerce and to enterprise customers (sports teams, rehab clinics, commercial gyms), and is bundled with the kMeter performance tracker, the Exxentric App for coaching/tracking, and certification/Academy training services.
Product overview
Exxentric offers a comprehensive flywheel training product portfolio centered on three core device lines: the kBox (vertical flywheel platform available in Active, Lite, Pro, Medical, and Rack variants), the kPulley (horizontal flywheel system in Go, Go+, and Pro variants), and the SingleExx (dedicated leg machines including LegExx for quadriceps and LegFlexx for hamstrings). These systems are complemented by a wide range of accessories (flywheels, grips, bars, harnesses, belts, cuffs, boards) and the kMeter feedback module. The Exxentric App provides real-time performance tracking, workout management, and coaching capabilities. The company also offers Club Exxentric (subscription rental service) and Online Academy educational content. All devices leverage inertial resistance technology enabling variable resistance, eccentric overload, and auto-adjusting intensity across 70+ exercises.
Differentiator
Problem solved
Functional benefit
Brands
- kBox: Flagship flywheel training platform for full-body strength, power and resilience training with adaptive resistance. Available in Active, Lite, and Pro models.
- kPulley
- SingleExx
- LegExx
- LegFlexx
- kMeter
- Club Exxentric
Products and services
- kBox Flywheel Training Platform Exxentric's flagship iso-inertial flywheel training platform providing adaptive, inertia-based resistance for full-body strength, power, and resilience training with more than 70 exercise variations, sold in multiple configurations including Active, Lite, Pro, Medical (CE-marked Class 1 device), and Rack variants.
- kPulley Horizontal Flywheel System Horizontal flywheel training system offering adjustable resistance angles for rotational power, pulling strength, and sport-specific athletic movements, with Go, Go+, and Pro variants targeting home users through elite facilities.
- SingleExx Leg Machines (LegExx and LegFlexx) Dedicated flywheel-based leg training machines — LegExx for quadriceps extension and LegFlexx for hamstring curl — featuring adjustable ROM, eccentric overload grip, kMeter integration, and options for single-leg and assisted overload modes, also available as the SingleExx Combo for comprehensive lower-body training.
- Exxentric App Mobile application providing real-time performance tracking, custom workouts, coaching for multiple athletes, curated workout library, and Academy educational content integration, available with free, Premium ($9.99/month or $99.99/year), and Professional ($24.99/month or $249.99/year) tiers.
- Club Exxentric Rental Subscription Monthly rental subscription program in Sweden offering the kBox Active system with kMeter, accessories, app access, coaching content, and pickup or home delivery, available on a 12-month plan at 499 SEK/month or month-to-month at 699 SEK/month (minimum 3 months), eligible for friskvårdsbidrag wellness-benefit reimbursement.
- Exxentric Academy Education Platform Educational platform offering online courses, tutorials, onboarding, and certification content covering flywheel training methods, available within the Exxentric App for beginners through to professionals.
- Exxentric Flywheel Training Certification Courses In-person certification and training courses — including Flywheel Training for Sport Performance, Trainer Course (Level 2), and Master Course (Level 3) — held at Exxentric HQ in Bromma, Sweden, for coaches, physiotherapists, and fitness professionals.
Quantifiable outcome
- NASA Artemis II astronauts use flywheel training for muscle and bone density preservation in zero gravity
- +3 more outcomes
Companies that use Exxentric
Customer profileNamed customers25 records
Segments6 records
Ideal customer profiles5 records
Exxentric technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration5 records
Feature7 records
Exxentric partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered flagship, core and minor.
- Canadian Space AgencyflagshipExxentric kBox used extensively in microgravity by Canadian Space Agency to test and develop the flywheel training protocol currently used by NASA's Artemis II crew for muscle and bone density preservation in space.
- NASAflagshipExxentric kBox Pro played a key role in developing NASA's Artemis II Flywheel Device. Both are belt-driven flywheel systems using inertia (not gravity) for auto-regulated resistance. The kBox technology informed NASA's space training equipment design.
- Karolinska InstitutetcoreFounders Fredrik Correa and Mårten Fredriksson collaborated with researchers at Karolinska Institutet (Sweden's leading medical university) developing flywheel training technology originally designed for astronaut muscle maintenance, supported by ESA and NASA.
- DHL, FedEx, UPSminorGlobal shipping logistics partners for worldwide delivery of Exxentric products from Sweden, ensuring reliable and cost-effective delivery to customers across 65+ countries.
- European Space Agency (ESA)coreESA supported the original Karolinska Institutet research project that developed flywheel training technology for astronaut muscle maintenance in space, directly leading to the founding of Exxentric.
- Bold AthleteminorPerformance training facility using Exxentric devices for multiple sports including hockey, volleyball, and soccer, serving as both customer and informal ambassador for flywheel training technology.
Scale indicators7 records
Recent moves9 records
Expansion highlights6 records
Exxentric competitors and assessment
Company assessmentDirect peers
- Tonal: Tonal is a direct peer in smart home strength training, offering a wall-mounted connected strength system with adaptive electromagnetic resistance and AI coaching. Both companies compete for the premium home-gym buyer seeking compact, app-connected, auto-adjusting resistance.
- Speediance: Speediance builds all-in-one smart home gym platforms with digital weight resistance and adaptive load. It competes head-to-head with the kBox for the connected home strength training buyer prioritizing compact form factor and variable resistance.
- Vitruvian: Vitruvian offers an AI-powered strength training platform with adaptive resistance that auto-adjusts to the user each rep. Closely parallels Exxentric's variable-resistance flywheel philosophy in a digital-weight format, targeting prosumer and home gym buyers.
- Tempo: Tempo is a smart home gym with a connected strength system, 3D sensors, and AI personal training. Both compete for the data-driven, premium home-fitness segment integrating app, performance tracking, and compact equipment.
- Concept2: Concept2 manufactures flywheel-based rowing ergometers (RowErg, SkiErg, BikeErg) widely used by professional athletes and CrossFit. Concept2 shares Exxentric's flywheel-resistance DNA and elite-sports customer base, though its product form factor is ergometer-focused rather than multi-exercise.
- Desmotec: Desmotec is an Italian manufacturer of flywheel-based isokinetic rehabilitation and sports performance equipment (D.Real, D.Wall). Directly comparable technology platform targeting the same clinical and elite sports segments Exxentric serves with kBox Medical and SingleExx.
Broad incumbents
- Peloton: Peloton is a broad incumbent in connected fitness with hardware + subscription + content across bike, treadmill, and strength. While not flywheel-based, it competes for the same connected home fitness dollar with vastly larger marketing and content budgets.
- Technogym: Technogym is a global premium fitness equipment manufacturer serving commercial gyms, sports teams, and high-end homes. It is a broad incumbent in the same overall category, with overlapping elite sports team and rehabilitation customers but a much wider portfolio.
- HUR: HUR manufactures pneumatic strength training equipment widely used in senior fitness, rehabilitation, and active-aging facilities. Comparable to Exxentric's medical/rehabilitation channel (kBox Medical, LegExx/LegFlexx) with overlapping clinic customer base.
Emerging players
- Aviron: Aviron makes connected rowing machines with flywheel resistance and gamified content, targeting the home fitness market. Shares the flywheel DNA and connected-fitness subscription model with Exxentric's kBox + App 2.0 combination.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Exxentric social profiles
Digital presenceExxentric compliance and trust
Trust signalCompliance3 records
Exxentric financial estimates
Financial estimateRevenue estimate
Valuation estimate
Exxentric leadership team
Management profileNumber of profiles
Profiles7 records
Exxentric subsidiaries and ownership
Company hierarchySubsidiaries1 record
Exxentric funding detail
Funding detailFunding overview
Funding rounds1 record
Investors1 record
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Exxentric M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Exxentric
What does Exxentric do?
Exxentric designs, manufactures, and sells iso-inertial flywheel-based strength and conditioning equipment — including the kBox vertical platform, kPulley horizontal system, and SingleExx leg machines — that uses inertia-driven variable resistance instead of gravity to enable eccentric overload training across more than 70 exercises per device. The hardware is sold direct-to-consumer via e-commerce and to enterprise customers (sports teams, rehab clinics, commercial gyms), and is bundled with the kMeter performance tracker, the Exxentric App for coaching/tracking, and certification/Academy training services.
Is Exxentric a public or private company?
Exxentric is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Exxentric founded?
Exxentric was founded in 2011. It employs 11 to 50 people.
Where is Exxentric based?
Exxentric is headquartered in Stockholm, Sweden, in the Europe region.
How does Exxentric make money?
Four revenue lines are on record. Hardware Sales (Flywheel Training Equipment) is the primary driver. The others are club Exxentric Subscription, exxentric App Subscriptions and training Courses and Certifications.
Who are Exxentric's main competitors?
Direct peers on record are Tonal, Speediance, Vitruvian, Tempo, Concept2 and Desmotec. Broad incumbents are Peloton, Technogym and HUR. Aviron is listed as an emerging player.
Does Exxentric have an API?
No public API is recorded for Exxentric.
What industry is Exxentric in?
Exxentric's product category is Strength Training Equipment. Its primary akta.pro industry code is CRAMADAG, Home Gym Systems & Smart Fitness Equipment Retail (Connected Mirrors, Smart Bikes, All-in-One Gyms), with a secondary code of CRAMADAB, Strength Training Equipment Retail (Racks, Benches, Barbells, Plates). Its NAICS code is 334510 and its SIC code is 3845.