I disagree, but only slightly. The advice about rotating shoes to prevent overuse injuries, paying attention to stress bottlenecks is general. Bodies differ i

I disagree, but only slightly. The advice about rotating shoes to prevent overuse injuries, paying attention to stress bottlenecks is general. Bodies differ in certain ways, but I've heard the same story as the shoes from many intensive exercisers. That I've never heard from a physician. Listen to your body. If it hurts, and it's not muscle burn, it's tendon/ligament/worse. Muscle burn is very obviously different to actual pain. Just stop. Change your posture so that part of your body isn't stressed, and the actual pain goes away. If you can't make actual pain stop hurting, take an extended break by cross training. Don't go home for the day. Always keep your exercise routine constant, but absolutely vary it to include "low stress" fallback options for tendon/ligament strain (pushups or own bodyweight, exercise bike, swimming). If the same part hurts again next time, you likely have a "weak" point. You will need to gradually increase intensity until the "weak" point isn't a bottleneck. Gradually means 10% intensity growth per weak maximum, and not pushing through actual pain. All of the above is really simple. The question is, why isn't what "actually works" the cutesy acronym?