Fitbit Vs Whoop

This week in the world of sports science, Fitbit Vs Whoop, poor coaches hiding behind the CLA, and underrated training methods.

Eric Curry

By Eric Curry
Last updated: June 8th, 2026
3 min read

This week in the world of sports science, here’s what happened…

  • Fitbit vs Whoop
  • Can poor coaches hide behind the constraints-led approach?
  • Hill sprints, farmer carries, and overspeed treadmill training

Fitbit vs Whoop

(Image: Verywell Fit)

A recent YouTube video by Rob ter Horst, known as “The Quantified Scientist,” has sparked an engaging debate among Fitbit and Whoop users. In his video, Horst compares the Fitbit Air to the Whoop Strap, drawing insights from the latest research and testing available.

When it comes to sleep tracking accuracy, Horst noted that the Fitbit Air consistently outperformed the Whoop Strap, which tends to overestimate both deep sleep and REM sleep. For heart rate monitoring, both devices did an excellent job while running and during indoor cycling. However, they each faced challenges during weight training, primarily because wrist tension and the act of gripping weights can affect their accuracy.

In terms of user experience, Horst suggested that the Fitbit app appeals more to casual health users, while the Whoop app is favoured by athletes. He also pointed out that the Whoop’s battery life is significantly superior to that of the Fitbit.

Ultimately, choosing between the two devices is tough. Horst believes that for most people looking for reliable tracking data, the Fitbit Air is the smarter buy. However, for those who seek coaching, recovery insights, strain targets, and motivational nudges, the Whoop Strap justifies its higher price tag.

Can poor coaches hide behind the constraints-led approach?

(Image: ChatGPT)

Experienced cricket coach Tom Flowers recently stirred up discussion with a controversial post on LinkedIn regarding the constraints-led approach (CLA). While he acknowledges the value of CLA and incorporates it into his coaching, he strongly believes it has led to an increase in what he calls “frauds” in coaching. According to Flowers, this approach gives poor coaches an “opportunity to hide behind deficiencies”.

He argues that those who implement the CLA often take a step back, with their “arms folded,” claiming they have created an environment where players are encouraged to “self-organise” and find solutions themselves. However, while Flowers recognises the importance of giving players time for self-exploration, he insists there are moments when the coach must “step in and actually coach.” He emphasises that players need feedback, technical understanding, and someone who can help them identify and solve problems.

In Flowers’s words, “the best coaches aren’t loyal to one methodology alone. They’re loyal to player development, knowing what works for them, and not being afraid to ‘coach’ players, expecting them to stand, listen and be patient”.

So, do you agree with Flowers? Are there too many poor coaches who lack technical understanding and communication skills, and hide behind the CLA?

If you would like to learn more about this topic, check out our courses Skill Acquisition and Cueing & Coaching Methods.

Hill sprints, farmer carries, and overspeed treadmill training

Chris Barnard (Image: YouTube)

In a recent YouTube video, renowned S&C coach Chris Barnard of Overtimeathletes explored some training techniques he feels are either overrated or underrated.

He kicked things off by discussing hill sprints, which Barnard argues are underrated. He believes this age-old training method is exceptional for teaching acceleration mechanics but is often overlooked in favour of more high-tech training methods.

Next up was overspeed treadmill training, which Barnard considers overrated. He points out that it can actually hinder proper max velocity mechanics, leading to undesirable effects.

Finally, when asked about farmer carries, Barnard firmly stands by their value. He praises them as a fantastic total body exercise and notes that they are relatively safe, making them a worthy addition to any training regimen.

So based on Barnard’s views, we should keep hill sprints and farmers carries and stop doing overspeed treadmill training. Do you agree with Barnard?

From us this week:

>> New course: Socially Supporting Athletes
>> New podcast: The Unseen Work of S&C and Sports Science
>> New infographic: Stretch Shortening Cycle
>> New article: Hydrotherapy

Access to a growing library of sports science courses

SFS Academy is an all-access membership to premium sports science education.

With SFS Academy, you’ll learn from some of the best coaches around the world as they teach you how to apply the latest research and practice with your athletes.

Access our course on Agility for FREE!

Learn how to improve your athletes' agility. This free course also includes a practical coaching guide to help you design and deliver your own fun and engaging agility sessions.

Access this course
Eric Curry

Eric Curry

Eric is a Strength and Conditioning Coach from Ireland. Eric holds a MSc in Sports Strength and Conditioning and an undergraduate degree in Sport and Exercise. Eric is also a Certified Strength and Conditioning Specialist (CSCS) with the NSCA. Eric currently works as a Strength and Conditioning Coach in Ireland predominantly with youth performance Tennis players. Eric also has experience working with athletes from basketball, martial arts, football, hurling, and Gaelic football.

More content by Eric
SFS Academy logo - white

Access our course on Agility for FREE!

Learn from a world-class coach how you can improve your athletes' agility. This course also includes a practical coaching guide to help you to design and deliver your own fun and engaging agility sessions.

Get Instant Access
Agility course devices