What do I do about lower back pain? I was doing sprints and leglifts the other day and now I can barely walk from the pain in my back. This happened last year too when doing sprints to gain back some footspeed going into the summer season. I have read that wearing inserts in your shoes may help if one leg is shorter than the other which often causes back problems and I think that might be part of my problem. I also am 6'4, 33 years, and 210 pounds so the hard pounding, weight, and length of my back might just be taking their toll as I age. Any suggestions will be appreciated. I have tried leglifts, crunches, etc. but all the sprinting in tennis and in other sports seems to force me to take a day off in between competitions for my back to recover.