use with p90x and these be perfect . right amount of weight for reasonably strong and athletic 43 year old -lrb- 180 lb -rrb- . allow quick change . be get some Platemates so that smaller 2.5 lb increment be possible . I know there be newer powerblock that allow 2.5 lb change but you have to open the handle and change cylinder out - add Platemates have to be quicker , and p90x really have you change weight pretty rapidly - I would rather not hit pause during the workout .