ok, i did the first one today too. and, i only have 4 risers , so i did the jump ups on 8", but, i am also only 5', and 54 yrs old, and i think i would kill myself trying to jump up on a 12" box. not sure, but there was nothing else i could do, so it will have to work. but, all the rest was good andi loved the workout. was sweatin' like CRAZY.
cathy