James Cooper | BTX Body Transformation London

Every year there are fitness trends. Most of them are harmless you waste some time, make slower progress than you should, move on. But in 2026, three of them are doing real damage. And the third one, if you’re doing it wrong, is not just slowing you down. It’s dangerous.

Here’s what they are, why they don’t work, and what to do instead.

2. Intermittent Fasting

I want to start by being fair: the instinct behind Hyrox is correct. Combining resistance training and cardiovascular conditioning is one of the most effective things you can do for your body. Arthur Jones built an entire methodology around it. It’s the foundation of how we train at BTX.

But Hyrox applies this principle in exactly the wrong way.

Resistance training works when your nervous system is fresh. To build muscle tissue and get stronger over time real, periodised progressive overload you need to be lifting at full capacity, with full technical control. The moment fatigue compromises your form on a loaded movement, you’re not training. You’re just accumulating injury risk.

The movements Hyrox uses — sled pushes, kettlebell lunges, burpee broad jumps under load — are already technically demanding. Add them to the back of an intense cardio session and you have complex movements, heavy weight, and a compromised neuromuscular system. That combination sends people to physios. It’s a recipe for disaster and I see it constantly.

The same logic applies to the cardio component. Zone 2 aerobic work, intervals, threshold training these drive adaptation when your cardiovascular system is working properly. Not when it’s been seconded to trying to keep you upright after a heavy lifting circuit.

The fix: Separate your resistance sessions from your cardiovascular sessions. Run both with proper structure and progression. Your strength numbers will improve. Your aerobic capacity will improve. And you won’t spend half the year dealing with injuries.

2. Intermittent Fasting

Intermittent fasting has been a fixture in fitness culture for years now, and it continues to be one of the most counterproductive approaches you can take for body composition.

Part of the reason it persists is psychological: for a lot of people, it provides a framework that makes restriction feel intentional rather than disordered. Starve yourself through the morning, eat everything at night, tell yourself it’s a protocol. The reality is usually a binge cycle with better branding.

Muscle protein synthesis the process by which your body actually builds and repairs muscle tissue requires repeated leucine stimulation throughout the day. Specifically, you need 30 to 50 grams of high-quality protein every 3 to 4 hours to hit the leucine threshold that activates the mTOR pathway (mechanistic target of rapamycin).

Miss that window for 16 hours and you have spent most of the day in a catabolic state, breaking down tissue rather than building it. Compress all your protein into a single evening window and you have activated the anabolic signal once, rather than four or five times. The difference in muscle development over months and years is enormous.

Spread your protein across the day. Start at breakfast. Thirty to fifty grams, every three to four hours. You stay satiated, you support muscle synthesis continuously, and you remove the psychological pressure that leads to evening overeating in the first place.

3. Misusing GLP-1 Agonists and Peptides

This is the trend I’m most concerned about right now — and the one causing the most tangible harm.

GLP-1 receptor agonists, most commonly semaglutide (Ozempic, Wegovy) or now Retatutide have gone from specialist obesity medications to something people are self-administering off social media with no clinical oversight, no dosing protocol, and no coherent plan.

The result, when misused, is predictable and genuinely damaging. Without adequate protein intake and a structured resistance training programme running alongside, GLP-1 agonists cause simultaneous fat and muscle loss. Body fat percentage remains unchanged. Lean mass drops. 

The person ends up lighter but metabolically worse off skinny fat, with a compromised metabolism and significantly reduced strength. They come off the medication and the weight returns because nothing about their nutritional behaviour has changed.

Used correctly, these medications are powerful. The reduction in appetite the removal of what people in this space call ‘food noise’ creates a genuine window of opportunity. 

The right approach is to use that quieter relationship with food to build real, lasting nutritional habits. 

Replace the binge patterns with consistent, protein-rich, nutrient-dense eating. Build the habits during the protocol so that when you come off, they’re already embedded. You stay in shape because your relationship with food has genuinely changed.

That is what a properly run GLP-1 protocol looks like. What most people are doing bears no resemblance to it.

At BTX, we manage this in partnership with our in-house physician. If you are using or considering GLP-1 medication, work with someone who understands body composition, not just weight loss. There is a significant difference.

Take away message 

Getting into the best shape of your life and staying there does not require a complicated approach. It requires doing the right things, correctly, consistently. 

Structured resistance training. Proper cardiovascular programming. 

Consistent protein nutrition across the day.

And if you are using pharmaceutical support, the guidance to use it properly.

Strong, lean, athletic. Built to last.

If you want to work with someone who takes all of this seriously, get in touch. 

Book a call with the link below 

https://bodytransformation.sproutwebsites.co.uk/book/