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Fresh studies, training methods and fitness tech — distilled for athletes who want to know what actually works.
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HRV Apps: What a Study of 206 Apps Really Reveals
An HRV app measures your heart rate variability and turns it into a single number for your recovery. Sounds simple. It isn't. A recent study went through 206 of these apps, and the result is sobering: many hand you a value without ever revealing how it came about.
July 22, 2026 · by Christopher Klenk
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ACSM Strength Training Guidelines 2026: What Changed After 17 Years
The ACSM rewrote its strength training guidelines for the first time since 2009, and a few points jumped out at me as a coach. What actually matters, what is ballast, where it fails advanced lifters, and why power after 40 is the point almost nobody has on their radar.
July 12, 2026 · by Christopher Klenk
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Sweat Biomarkers in Smart Textiles: Lab Values Without Blood?
A smart textile measures lactate, electrolytes and more straight from your sweat, no prick required. What the study can really do, where its limits are, and what self-coaching athletes get from it today.
July 4, 2026 · by Christopher Klenk
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Strength Training Without a Max Test: Three Ways to Set Your Load
A new study compares three ways to set training load: fixed percentage, reps in reserve, and barbell velocity. The real takeaway for self-coached lifters: two of them skip the risky 1RM max test — and work just as well. Here's how to apply it.
June 20, 2026 · by Christopher Klenk
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90 Minutes of Strength Training for a Longer Life? What the Study Shows
90 to 120 minutes of strength training a week — that's supposed to be the sweet spot for a longer life, according to a new 30-year study. An easy number to grab onto. That's exactly the problem.
June 16, 2026 · by Christopher Klenk
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ChatGPT vs. Dietitian: What the New Study Reveals
ChatGPT will build you a meal plan on demand — but as well as a trained dietitian? A new study in the Journal of Nutrition tested exactly that. The result is awkward for both sides.
June 14, 2026 · by Christopher Klenk
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FITT-VP Study: Which AI Writes the Better Training Plan?
This is not about which AI model writes the best training plans — all four LLMs in the study are outdated by now. The interesting part is the method: a new study systematically rates AI training plans against FITT-VP, an established framework from sports medicine.
June 12, 2026 · by Christopher Klenk
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AI Chatbots in Fitness — New Study: Trust Follows Relevance
A new study shows: AI chatbots are being used in fitness — but trust only forms when they're relevant to your training. What this means for athletes.
July 1, 2026 · by Christopher Klenk
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VBT Sensor in Resistance Bands: What the 2026 Study Shows
Chinese researchers built a resistance band with a fiber velocimeter inside — real-time VBT feedback for a training tool that has never had a measurement layer. What the 2026 study shows, and what it would mean for strength training and rehab.
June 12, 2026 · by Christopher Klenk
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DFA α1 Also Tracks Recovery? What a New Study Shows
A new study in the European Journal of Applied Physiology confirms DFA α1 as an intensity-sensitive biomarker across all training zones — and reveals a surprising recovery signal that RMSSD simply can't provide.
July 13, 2026 · by Christopher Klenk
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AI in the Gym: Can It Really Replace the Personal Trainer? Where We Are in 2026
Hotworx, NYSC, Vasa, Life Time, Planet Fitness: AI coaches are landing in US gyms in 2026. A practitioner's read from 17 years of training people — what the technology can do, where it structurally fails, and why the question isn't "AI or trainer" but "who does which part."
June 12, 2026 · by Christopher Klenk
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ChatGPT as a Technique Coach: What a Study on AI Feedback in Sport Shows
ChatGPT feedback improves sports technique measurably faster than feedback from a training partner – that is the finding of a randomised study from March 2026. What sounds like a university context at first glance is full of transferable ideas for anyone who wants to try ChatGPT technique-feedback training for themselves. At a glance: a study (n=56, randomised) shows that structured ChatGPT feedback improves sports technique significantly more […]
April 21, 2026 · by Christopher Klenk