I'm wondiering whether one of my weight-lifting techniques, which I've been using for years, is a bad idea.
I'll pick a weight that I can do 12-15 reps, and do that to exhaustion. I'll then drop the weight down 15-25% or so, and immediately do that weight to exhaustion (usually 5-10 reps). Depending on how I feel, I may drop down another 15-25% and push to exhaustion a third time. I've never gone a fourth round, but I have thought about it.
I usually do this only for the bigger muscle groups (quads, hammies, glutes, pecs, delts), but occasionally I'll do it for the calves, biceps, or abs.
I use this tecnique because my goal is muscle endurance, not bulk. But am I risking injury by pushing too hard? Is there a better way to accomplish what I'm trying to do?