Have you ever noticed some skinny guys are way stronger than their size? It's their tendons. Here's how to train yours at home without getting bulky: 4 holds, the one rule that decides whether tendon training works, a simple wall-hold test, and a 12-week plan. If you watched "How Some Skinny Guys Are Stronger Than Big Guys", this is how you train it. 🔗 Free home plans and self-tests: 🤝 Train with the community on Telegram: Chapters 00:00 - Why some skinny guys are so strong 00:35 - Hold 1: the wall hold (and the test) 01:52 - Hold 2: the heavy calf hold 02:59 - Hold 3: push something that won't move 04:03 - Hold 4: the hang 04:58 - The rule (hold long, hold heavy) 06:16 - The whole plan 07:17 - Your wall hold result 07:52 - Join the community Research mentioned: Kubo et al. 2001 (J Appl Physiol: 12 weeks of 20-second isometric holds made tendons 57% stiffer, strength +34%, muscle volume +8%); Kubo et al. 2001 (J Physiol: same total work, only the 20-second holds stiffened the tendon, not 1-second contractions); Arampatzis et al. 2007 (J Exp Biol: only high tendon strain made the Achilles stiffer and thicker); Bohm et al. 2015 (Sports Med Open: meta-analysis of 27 studies, loading intensity matters most); Moritani & deVries 1979 (Am J Phys Med: early strength gains are mostly neural). The wall-hold tiers are our own simple scale, not a medical or fitness assessment. Image (Wikimedia Commons, public domain): "Rectus femoris", Gray's Anatomy plate modified by Uwe Gille, : Disclaimer: We are not doctors, physical therapists, dietitians, certified trainers or any other licensed health or fitness professionals. This video is for education and entertainment, based on the published research listed above, and is not personal medical, training or nutrition advice. Isometric holds raise blood pressure: breathe through every hold, and check with a doctor first if you have high blood pressure, a heart condition or a joint injury. Make sure any door frame, bar or step you use is solid. Stop if you feel sharp joint pain. If you're under 18, keep the effort medium and skip extra weight. Winter Arc challenge: free to enter. No purchase or subscription needed. Judged on improvement (test numbers and check-ins), no physique photos; the prize is bought by us. Rules pinned in the Telegram channel: Not sponsored by or affiliated with Gymshark or YouTube. Subscribe for science-based fitness, form fixes and no-equipment workouts, drawn in manga ink. #tendontraining #isometrics #calisthenics