In 2021, Nigel faced a life-changing diagnosis—heart failure, with a 40% loss in heart pump capacity. With a background in healthcare data and analytics, he had over 30 years of experience training with heart rate monitors, and knew increasing his VO2max was crucial for rehabilitation. But traditional endurance training wasn’t working.
“As part of my rehabilitation, I needed to increase the efficiency of my remaining heart capacity. I had tried lots of Zone 2 cycling, but it negatively impacted my heart rhythm and took too long each week. This restricted the amount of time I had for other rehabilitation goals,” Nigel explains. He needed a safer, time-efficient alternative—and found it in CAROL Bike’s REHIT workouts.
Why CAROL? A smarter approach to VO2max training
For Nigel, REHIT’s ability to deliver a VO2max training dose in just 2×20-second sprints was game-changing. The efficiency allowed him to train effectively before gym sessions without cutting into strength and mobility work.
“The 3x REHIT rides a week can be done before a gym session, minimizing training time while still improving fitness,” he says.
As a longevity coach and founder of Longevity Performance Coaching, Nigel also needed a structured, measurable way to improve VO2max for his clients. CAROL Bike fit seamlessly into their training plans:
“The 2×20-second sprints can be done at the start of a gym session, leaving 50 minutes for strength, mobility, and hypertrophy—all essential for long-term health and performance.”
The results: A 23% power increase—and more to come
Since starting with CAROL Bike in September 2024, Nigel has seen a 23% increase in peak power and is now focusing on improving his VO2max with 3x REHIT rides per week.
“My fitness score has improved by 6%, and I’ll test my VO2max again at the end of the month.”
Alongside REHIT, Nigel also incorporates 10×6-second sprints for added volume and the Fat Burn ride for an extra challenge.
Watch Nigel in action—using CAROL Bike to cut his workout time while maximizing VO2max and performance gains.
His advice? Be ready to work
Nigel emphasizes that, as with any training, commitment is key to seeing results with CAROL Bike.
“If REHIT is your reason for buying it, you need to be consistent. The training dose is so small that if you miss a session, you’re skipping most of the training.”
And while the AI-personalized workouts remove the guesswork, they require effort:
“You have to be prepared to follow the bike’s analytics in terms of resistance and intensity. If you get on and work hard, it’s incredibly effective. But if you just want to pedal at whatever pace and resistance you feel like, the functionality of the bike is wasted on you.”
Why CAROL Bike stands out
Beyond the efficiency, Nigel finds CAROL Bike offers a unique competitive edge—both for personal training and fitness businesses.
“It’s great at giving you benchmark data on your own performance and other riders in your group, so there is a fun competitive element to what is a challenging 20 second sprint. If you like data and beating your last score, then it’s very good at keeping you interested. It’s like discussing how much weight you can squat, as everyone is doing the same exercises, so it’s a genuine benchmark of cardiovascular fitness across a group.”
For gym owners and personal trainers, CAROL Bike is a powerful tool:
“It delivers a measurable VO2max training dose in minutes, making it a differentiator in the fitness marketplace.”
And for those considering a purchase?
“With a 2×20-second REHIT session, you have no excuses. It’s the easiest training modality to comply with each week.”
Ready to achieve more in less time?
Try CAROL Bike at home, risk-free for 100 days. If it’s not for you, return it for a full refund—no questions asked.
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All our experts have MSCs in Exercise Science, and they’re here to answer your questions. Whether it’s about the science behind CAROL Bike, or general fitness advice, whatever’s on your mind—we’re here for you.
