Your Cardio, Done in 5 Minutes
Your workout,
done in 5 minutes.
The world's first home REHIT bike. Two 20-second sprints deliver the same results as a 45-minute run, personalized by AI to your fitness level.
Superior health, in 90% less time.
Improve your cardio fitness in 8 weeks — like turning back the clock 10 years.
Lower your risk of type 2 diabetes, and blood pressure by 5%.
Burn twice as many calories as regular exercise, minute for minute.
All the benefits of a 45-minute run, in a single 5-minute ride.
Two 20-second sprints.
That's the whole workout.
Reduced Exertion HIIT was developed with leading exercise researchers. CAROL's AI applies instant, personalized resistance so each sprint pushes you to exactly your limit.
Gentle pedalling to prime your legs.
AI resistance kicks in. You mobilize 25–30% of muscle glycogen.
The second sprint triggers the adaptation. Done.
Try it for 100 days.
Love it, or send it back.
- 100-day risk-free home trial
- Free delivery option
- 5-year frame warranty
- Free heart-rate chest belt
- HSA/FSA eligible
- Delivered in 7–14 days
Secure checkout · $300 discount applied automatically
Loved by 35,000+ riders.
"In just 5–10 minutes you get a cardio workout equivalent to 45 mins. The biggest barrier is time — CAROL removes it. Absolute game-changer."
"The AI personalization takes the guesswork out of my workouts. I keep getting challenged and exceeding my goals, week after week."
"The REHIT ride is revolutionary. It's the most effective way to get the fittest, the fastest. A genuine game changer for me."
Dave Asprey — the father of biohacking
Dr. Michael Gervais — performance psychologist
Garage Gym Reviews
Done thinking? Start risk-free.
$300 off through July 19. Try CAROL at home for 100 days — if it's not for you, send it back for a full refund.