I've been dealing with tendonitis and chondromalacia in my knee since this past October. After giving up first squats & lunges, then leg presses, then the rowing machine, then the stationary bike, all I'm able to do with my lower body is straight-legged deadlifts and the elliptical trainer. The elliptical is what I use for my Tabata sprints, but I usually don't make it to the gym as often as I would like. What options do I have for sprinting at home? It has to be low-impact, so things like running and jumping rope are out, and I can't put much weight on my bent knee, so burpees or anything else that would load bent knees are out.
After a few months of conservative treatment and no improvement, I'm about ready to go get a steroid shot. If anyone has any miracle cures, I would be more that happy to hear them.