Sprinting vs. squats debate

A viral fitness thread turned a familiar gym argument into a simple claim: sprinting builds glutes better than squats. (x.com) The post paired that claim with a stripped-down plan: walk daily, lift twice a week, then finish with sprints. Other fitness creators reposted it, and the routine spread across X and short-form video within days. (x.com) The anatomy behind the claim is straightforward. The gluteus maximus is the large hip muscle that drives the leg backward, and a classic biomechanics paper found it is much more active in running than in walking. (pubmed.ncbi.nlm.nih.gov) Sprinting also lines up with what researchers see in elite athletes. A Loughborough University study found elite sprinters had hip extensor muscles 32% larger than sub-elite sprinters, and gluteus maximus volume alone explained 34% to 44% of the variation in sprint performance. (repository.lboro.ac.uk) That does not mean sprinting has replaced squats in the evidence. A randomized trial from Auburn University found back squats and hip thrusts produced similar glute muscle growth in untrained college-aged participants over the training period. (pmc.ncbi.nlm.nih.gov) Reviews of glute training make the same point in broader terms. The glutes respond to several loaded hip-extension exercises, and strength coaches still use squats because they train the glutes, quadriceps, and trunk together under external load. (pubmed.ncbi.nlm.nih.gov; pmc.ncbi.nlm.nih.gov) The sprinter-physique argument also leaves out selection effects. Researchers comparing sprinters with non-sprinters found sprinters had larger posterior-chain muscles overall, but those studies do not show that copying sprint sessions alone will reproduce an elite sprinter’s build. (pubmed.ncbi.nlm.nih.gov) There is also a practical difference between “sprinting” online and sprinting on a track. Health guidance on hamstring injuries notes that strains often happen during sudden explosive efforts, including sprinting, and running coaches typically recommend a dynamic warm-up before fast work. (nhs.uk; acefitness.org) That is why many coaches treat sprinting and squats as complements rather than substitutes. Sprinting trains force fast, while squats let athletes add force progressively with a barbell, and the viral routine caught on by packaging that idea into a short, repeatable template. (simplifaster.com; x.com)