I was pretty confident I had the difference between calisthenics and plyometrics down: the former were mainly stretches and certain repetitive, bodyweight exercises like push-ups and pull-ups, the latter were also being bodyweight exercises but ones geared towards dynamism and explosiveness - little jumps and whatnot were added into regular exercises; something to do with "overloading" muscles at "peak work phase". However, I was then confused by people saying that things like pull-ups, involving apparatus, were bodyweight exercises but not calisthenics, and then further confused when I was shown stuff like this supposedly all-calisthenics exercise programme which both involved apparatus and (to my eye) very "plyometric" movements: Barology 101 DVD So what's the deal? Can exercises involving bars be described as calesthenics? Are plyometrics just a certain type of calisthenic exercise re-branded to look fresh and exciting? Or what? Maybe it seems pedantic, but I'd like some solid definitions if these are going to be standard terms of reference.