The 5-minute habit helping John chase longevity.

"It’s a technological marvel"

At 72, businessman John uses CAROL Bike to hit his longevity goals—improving VO2max through just 2x20-second REHIT sprints a few times each week. With no time for Zone 2, here’s how CAROL became his favorite “technological marvel”.
Last update: 30 January 2026

From feed to fitness

When John first came across CAROL Bike on Facebook, what grabbed him wasn’t flashy colours or scenic routes. It was something much simpler: time. 

 

“What attracted me to CAROL Bike was the quick REHIT sessions, since I am a 72-year-old businessman and I do not have time for a lot of Zone 2.” 

 

For someone still working, still busy, and still thinking long-term about his health, that mattered. 

Training for longevity, not just for fitness​

John isn’t chasing arbitrary performance numbers. His focus is clear: longevity. 

 

“CAROL Bike has helped me improve my VO2max which aligns with my longevity goals,” he explains.  

 

With CAROL Bike’s workouts, you can reset your VO2max by 12% in just 8 weeks—that’s like turning the clock back on your age by 10 years. 

 

Instead of long blocks of steady-state cardio, John built a routine around short, high-impact work: 

 

“I try to do 2–3 REHIT workouts per week plus some resistance training.” 

 

That simple structure—REHIT + resistance—became his foundation. 

 

“Those 20 seconds, at least twice per week, help me the most.” 

Training for longevity, not just for fitness

John doesn’t overcomplicate his message to anyone considering CAROL. 

 

He’s busy, he knows how hard it can be to fit fitness around real life, and he’s found something that works for his goals and schedule.  

 

His advice is simple: 

 

“Do not hesitate for a moment to purchase a CAROL Bike. I absolutely love it. It’s a technological marvel.” 

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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.

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