The timing of this thread is impeccable. I've been doing stiff leg dls for years, and its the only ham exercise I actually feel works for me. Last Thursday, did my normal quad workout (squats, leg presses, leg extensions) and went to the stiffys (as I call em). Did two warm up sets. On the third set, with a little more weight, but no more than I usually do (~195lbs). On my sixth rep, on the way down, it felt like someone came up behind me and kicked me in the ham with a steel toed boot. I dropped the weight and swung around ready to fight ..... no one was there. Immediately it hit me what happened, torn hammy. Its been 4 days of limping and the bruising has made it to the surface. I'd put up a pic, but my gf has the camera and is on vacation.
You know what though. In a few weeks/months when it heals, I'll be back doing stiffys.
just be careful, ive pulled my right hamstring 5 times and it still isn't near the size of my left nor is it as strong, ur lower back will probably start to hurt soon as it takes up the slack for the hammy