So I do the usual gym 3 times a week for the standard push/pull/leg day. We have ab crunch machines/benches and a rotary torso. Is there much use of these or am I better sticking to leg raises and popping somthing else in that doesnt involve a machine? Besides that is there much benefit for back hyperextensions? Lower back seems to be a tricky area to work out and also weary of injury. Majority of my other excercises are compounds tried and true stuff but unsure on the core (unintentional lame rhyme).