K sounds like it will accomplish my goal of upping my endurance :) I need that ha we had four hours of crawling up and down a hill full turnouts and breathing tank and mask and after four hours I wanted to curl and a ball and wimper lol better then most couple kids gave up after and hr after three more kept dropping off under half us made it and none were standing by the end haha I wish I could have seen that from outside the group. 20 fully dressed fire students laying sprawled out among snowbanks and the road