Originally posted by: brikis98
Be very very cautious with lower back injuries. They are a total bitch and can make life very unpleasant. Worse yet, they often start as a very minor ache, a small twinge, a bit of soreness, a little pinch, etc. This just fools you into continuing to do the stupid activity (squat, deadlift, etc) you're doing that hurts your back and makes the injury worse and worse. Check out my
lower back pain thread for info on one possible cause of lower back issues, as well as stretches and exercises you can do to help. For now, don't worry about finding substitute exercises. If your back is injured, the best thing to do is to just rest. You might have to go a week or two with a far less effective exercise routine (ie, SS w/o squat & deadlift), but it's well worth it to keep your back safe.
Moreover, the main feature of the deadlift is it's ability to stress the back (in a safe manner, when done properly), and that's exactly what you want to avoid for now, so just forget about the exercise or any substitute for it. With squats, the situation is a little better, but good alternatives are still tough to find. The reason is that the squat use almost all the muscles in your body (something like 70%+), which produces tremendous total body strength and muscle growth. That's why you do so many of them in SS. And that's also why it's really hard to find something to replace them with that's anywhere near as effective. The only really good alternative would be the front squat. It's a pretty similar motion, but tends to place less stress and torque on the lower back. If you can do that 100% pain free, it's a great choice. Beyond that, there are only partial replacements. There are plenty of exercises that will hit your legs hard, but they won't be
nearly as total body as a squat and really can't be counted as proper substitutes. These include lunges, leg press, step ups, body weight squats (done at very high rep & intensity, a-la CF), box jumps, single leg squats, leg extensions, hamstring curls and so on.