“It sounded like sorcery.”

Some riders find CAROL through a friend, a podcast or a gym. Kortney found it through her doctor.

“It was through my functional medicine doctor! He had a vision of opening up a center with 5 or 6 bikes, so his elderly and time-poor patients could come in and work out in just 5 minutes.”

Five minutes, three times a week, real fitness gains. For Kortney, the pitch was hard to believe.

Sorcery, or science?

“It sounded like sorcery and fairytales. But I trust my doctor emphatically, so I figured I’d better give it a shot and confirm CAROL’s greatness.”

It isn’t magic. It’s REHIT: two 20-second all-out sprints inside a 5-minute ride. The protocol is scientifically proven to improve VO₂max—a key measure of cardiorespiratory fitness—by 12% in just 8 weeks.

A bike, a surgery, and a long wait

The timing could not have been worse. Kortney’s CAROL Bike arrived the day before she flew from Las Vegas to Australia for ACL surgery.

So it waited. She got home a month ago, got on the bike, and the first result has already arrived.

“I only just got back a month ago, and my VO₂max has increased already!”

Dying for 10 seconds, done in 5 minutes

So far, Kortney has ridden only one workout: CAROL’s signature REHIT Intense.

“I get such an extreme high after the sprint. It feels like I’ve just finished a CrossFit WOD. I’m dying for 5 to 10 seconds, then it passes, and I’m literally done within 5 minutes. It’s CRAZY!”

That is the design. The sprints are short enough to go truly all out, and CAROL’s AI sets the resistance for each rider, so every sprint is as hard as it should be. No more, no less.

Four weeks in, and hooked

Kortney has been riding for only 4 weeks. It’s already a habit.

Her advice to anyone thinking about CAROL Bike?

“DO IT! It’s addictive, and it knows exactly how much to push you. It’s WILD!”

Start your 100-day risk-free CAROL Bike trial now.