Exxentric®
Reinventing strength training with the kBox, kPulley and SingleExx flywheel training systems. Because strength matters.
40 employees · est. 2011 · Bromma, Sweden
Rumble Boxing
Boxing ✖️ Strength Training 🥊 💥 Explosive, full-body group fitness classes for all levels
516 employees · est. 2011 · United States
Rumble Boxing is the larger of the two.
Side-by-Side Comparison
| Metric | Exxentric® | Rumble Boxing |
|---|---|---|
| Founded | ||
| Founded | 2011 | 2011 |
| Headquarters | ||
| Headquarters | Bromma, Sweden | United States |
| Employees | ||
| Employees | 40 | 516 larger |
| Industry | ||
| Industry | Education, Health Care | Health Care, Health and Wellness, Sports |
| Funding Stage | ||
| Funding Stage | Grant | Series B |
| Total Funding | ||
| Total Funding | Not tracked yet | $31.00M |
| Funding Rounds | ||
| Funding Rounds | Not tracked yet | 5 |
| Services | ||
| Services | Not tracked yet | Boxing and HIIT workouts, Strength training classes, Fitness studio experiences, Motivational fitness sessions, Rumble Boxing App features |
| Target Customers | ||
| Target Customers | Not tracked yet | Fitness enthusiasts, Beginners (first timers), Boxing fitness seekers, Customers seeking motivational workouts, Loyalty program participants |
| Taxonomy | ||
| Taxonomy | Not tracked yet | Boxing-Inspired Fitness, Group Fitness Classes, High-Intensity Interval Training, Strength Training, Metabolic Conditioning, Explosive Cardio Circuits, Full-Body Workouts, Teardrop-Style Boxing Bags, Lean Physique Development, Confidence Building, Sports-Based Conditioning |
| Website | ||
| Website | exxentric.com | rumbleboxinggym.com |
About Exxentric®
Exxentric® is a Swedish startup founded in 2011, pioneering Flywheel Training with its kBox, kPulley, and SingleExx flywheel training systems. The company's slogan "Reinventing strength training with the kBox, kPulley and SingleExx flywheel training systems. Because strength matters." encapsulates i...
About Rumble Boxing
Rumble Boxing, founded in 2011, is making waves in the Health Care, Health and Wellness, and Sports industries with its innovative approach to group fitness. Located in the United States, the company offers explosive, full-body group fitness classes that seamlessly integrate the skills and drills of...
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Funding, hiring, leadership and stack changes at Exxentric® and Rumble Boxing — by email.
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Compiled from the BounceWatch company index. We last looked at Rumble Boxing on 6 Apr 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.