205 – Rahul Bernath – Is the CAR.O.L Bike a Good Fit for your HIT Business?

Rahul Bernath
Rahul Bernath

Rahul Bernath is the Sales and Marketing Director for CAR.O.L. Before joining CAR.O.L, Rahul graduated from the University College London with a First Class Degree and worked with some of the UK’s most valuable consumer brands in marketing and sales.

CAR.O.L was founded by Rahul’s parents; both serial entrepreneurs from Silicon Valley. Since joining CAR.O.L, Rahul has helped grown the revenue by 10x and expanded its operations into the USA.

CAR.O.L stands for CARdiovascular Optimization Logic. It is an AI-powered, interactive exercise bike with self-learning algorithms that took four years to program. CAR.O.L automates each HIIT workout and guides you with touchscreen and audio prompts.

In this podcast, we discuss the genesis of CAR.O.L, it’s suitability in a HIT Business, how CAR.O.L can help to differentiate your business, and much, much more.

Learn how HIT Studio owner, Thom Tombs, generates more revenue with CAR.O.L in our podcast here

Get proven systems to build a highly profitable smart gym inside HIT Business Membership



Enjoy the show!

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Comments 8

  • The combination of the bike plus the software is very cool. I’d love to have one at home… But at $3,000 upfront, and $144/year licensing fees, it is out of my price range.

    I like doing a couple of HIIT sessions each week to supplement my strength training. However, if you look at suggested programs from various gurus, they are all over the place in terms of the work-to-rest ratio, the duration of the work intervals, the duration of the rest intervals, the number of recommended intervals, and the recommended frequency. The REHIT program is definitely toward the minimalist end of the recommendations that I’ve seen.

  • I listened to this a second time, and have some additional comments and questions:

    * He says that they originally tried to find exercises that didn’t require specialized equipment, but couldn’t find anything that worked consistently. I wonder what was missing? Why wouldn’t a flat out sprint on a generic stationary bike, or stair stepper, or rowing machine provide the same benefit? This is important because you don’t want people’s excuse to shift from “I don’t have enough time” to “I can’t afford the bike” (or the cost of the training sessions).

    * The REHIT protocol is based on Wingate Sprints, which I’ve seen described as a test of lower body anaerobic power. So wouldn’t it work better if you engaged the upper body at the same time, e.g., rowing machine, Schwin Airdyne or Assault Bike, Bowflex Max?

    * The protocol has you perform two anaerobic sprints at maximum power output, to drain glycogen from the leg muscles. That kind of intense exercise will trigger some cardiovascular adaptations, and produce some beneficial hormonal signalling. But that is also what traditional HIT protocols are supposed to do. So I agree that it seems somewhat redundant to HIT strength training. The plus is that you could do this 3 times per week, whereas a full on strength training session would limit you to just 1 or 2 sessions per week.

    * Perhaps there are adaptations from SS cardio that are also important, but are not as easily measured? Epidemiology shows a pretty strong association between volume of activity and improved health outcomes, even if the activity isn’t intense enough to improve VO2 max, maximize insulin sensitivity, etc. Beware of the unknown unknowns…

    * I get that having your clients feel crushed after a training session may be a good selling point for some customers (type A personality). But doesn’t this veer into Crossfit territory, where the objective is to feel as trashed as possible after your metcon (whereas the real objective should be to trigger as much beneficial adaptation as possible)?

    I still think it is cool technology, but I’d like to figure out a low cost way to do it at home.

  • Hi Lawrence trying to buy a Carol but the coupon (HIB) doesn’t work, could you help me out?

    • Hi Jonas, that’s not very good is it! I’ve just messaged Rahul and hopefully we’ll get this fixed asap. Sorry for any inconvenience!


  • Hi Greg P, thanks for your comments!
    Answering in order:
    1. the REHIT protocol is the shortest HIT protocol that’s evidenced to yield the same (if not better) results vs. medium intensity continuous training (MICT).

    2. It’s important to overcome inertia if you hope to achieve max intensity. With any other machine/no equipment, you are working against resistance already while building up to max speed. This inhibits your ability to actually achieve max (as you get tired already building to it), which makes the exercise much less efficient.

    3. The objective of REHIT is to improve cardiovascular health. To do this, we need to deplete enough glycogen in your body to stimulate the adaptations which lead to improvements in aerobic capacity. There is enough glycogen in the thigh to do this. If we start introducing other muscles the workout risks becoming dangerous or, again, inefficient. We want the easiest, most fool proof way to increase cardiovascular health. REHIT is it.

    4. yes, but the evidence shows that REHIT is better at doing this.

    5. We don’t want clients to feel crushed after using CAR.O.L (although some do!). It’s all about the minimum effective dose that will still yield amazing results.

  • How do you like me now?

    CAR. O.L. Study blows McGuff’s & Little’s Global Metabolic Conditioning out of the water.

    Real scientist at work!


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