I'm looking for an evidence-based 'how to squat' guide (and actually the gym more generally).
Free online would be great but for the gym generally I'd be happy to buy a book.
Obviously everyone's guide is based on some evidence, I'm hoping for a guide that looks at clinical data or trials (if there are any), reviews published literature etc.
To clarify, I'm wanting a guide to inform my gym activities, not for research - I'd like to know when I read things like 'don't let your knees extend beyond your toes or you'll risk damaging your knees', that these views are based on evidence like the above (if available, or whether the recommendations are just based on biomechanics first principles or whatever).