[ice109]

this kind of thinking is just another iteration of self-serving anti-intellectualism (akin to climate change denial and anti-vaxxing). there is absolutely hard exercise science you can read in order to exercise more effectively than "stretching" (an activity whose value has never been empirically proven) and "body-weight" exercises (slightly more effective than nothing but pales in comparison to real weight training and cardio). protein supplementing does work[1], creatine does work[2], caffeine+ephedrine does work[3] (though you can't buy that anymore). the hard science is in exactly the same place it always is: research journals. for starters I always recommended exrx.net.

[1] http://m.ajcn.nutrition.org/content/96/6/1454.short

[2] https://jissn.biomedcentral.com/articles/10.1186/1550-2783-4...

[3] http://europepmc.org/abstract/med/1318281