Honestly... i think the older you get.. the more you have to warm-up... when i was in my teens, i would strap on the football pads and helmet and go full speed in the bull ring... in my 20's never warmed up while hitting the weights... now in my early 30's i feel the need to start off light my 1st and 2nd set before adding the weights... im sure in my 40's ill be warming up for 20min on a cardio machine before the weights ... damn aging sucks