I'm using a Poliquin 12 week program to increase maximal strength--it's designed for arms, but can carry over to other parts obviously. However, one cycle in it calls for lifting 6-8 to absolute failure. I train alone, and obviously, this is not safe without using dumbbells or a spotter. Since I want to incorporate this for legs as well, is there a good replacement for absolute failure? Does it matter if I back off early in the set? Thanks, in advance.