The name is a joke with two punchlines. The B.S. stands for Behavioural Science. It also stands for exactly what you think it stands for, because most of what the fitness industry tells you about keeping members is, frankly, rubbish.
“Sell harder. Run another promo. Blame the members for lacking motivation.” That advice has been recycled for decades and the numbers haven’t budged. Most gyms still lose 30 to 50 percent of their members every single year. If the standard playbook worked, it would have worked by now.
Where this came from
I’ve spent over 30 years in the fitness industry. Running gyms, selling memberships, watching the same pattern on repeat. People signed up full of good intentions, came for a while, then quietly disappeared. For most of that time I assumed it was just how things worked.
Then I started reading the research. Not fitness industry research (there isn’t much worth reading), but behavioural economics and cognitive psychology. The stuff that explains why people make the decisions they make, why they stick with things or walk away, and why their reasons rarely match what they tell you in an exit survey.
The answers were all there. They just hadn’t been translated into language a gym owner could use on a Monday morning. That’s what this site does.
How it works
Every piece of content on this site follows the same process:
Start with the science. Each post begins with a published study from a peer-reviewed journal. Not opinion pieces, not industry surveys, not “what worked for my gym.” Actual research with methodology, sample sizes, and findings you can trace back to the source.
Translate it for the gym floor. Academic papers are written for academics. The insights buried in them are gold, but they’re wrapped in jargon that nobody outside a university has time for. Every post on this site strips that away and shows you what the research means for your business, your marketing, and your members.
End with something you can use. No post finishes without a practical takeaway. Something you can change, test, or implement without hiring a consultant or buying a course. If it doesn’t pass the “can I do this next week” test, it doesn’t make it onto the site.
What’s on the site
The blog publishes research-backed articles on retention, marketing psychology, member engagement, fitness advertising, and the behavioural science behind why people join gyms, stay at gyms, or leave them. Each post is built around a specific study and ends with practical strategy.
The Behavioural Science Library is a growing collection of cognitive biases, each explained through the lens of fitness and gym ownership. Every entry breaks down the psychology, links to the original research, and shows you how the bias plays out in your marketing or on your gym floor.
The Copywriting section covers the specific biases that shape how people read and respond to written messages. Useful when you’re writing ads, emails, social posts, or anything where you need someone to actually do something after reading it.
Why it matters
The fitness industry is brilliant at getting people through the door. It is remarkably bad at understanding why they leave. That gap costs gym owners millions in lost revenue every year, and the usual response is to just sell more memberships to replace the ones that cancelled.
Behavioural science offers a different approach. Instead of guessing why members leave, you can understand the actual psychological mechanics behind their decisions. Instead of copying what other gyms are doing, you can build retention and marketing strategies grounded in how people actually think and behave.
That’s not theory. That’s the difference between a gym that churns through members and one that keeps them for years.
Got a question or want to push back on something? ray.smith@fitnessisbs.com