I have my roots in powerlifting and my upper leg training has always been deep squats, never anything more. My quads are average to above average, developed from heavy squats. Two months ago I tore my groin on the upper end of the muscle. I may never be able to squat heavy again, certainly not in the next year. I went as far as to buy a leg extension/ leg curl machine to supplement leg training during my rehab.
Now here’s my problem; leg extensions are not doing shit for me. It’s a joke. I could literally run 5 miles the next day when previously I could barely get out of bed. High reps, low reps; nothing is like squatting. Does anyone have an idea how to at least keep what I got?