I've been lifting since I was 15. Started cross-traing in the military and have always been in good shape. Went through extensive physical training in the military at 22 yrs. old. It seems my body just soaked it up and adapted just fine. Now I'm 36 and finding that I ache alot more and seem to be quite a bit more stiff than I remember during heavy training. However, I'm going from boxing to MMA..haven't boxed in 8 years. The increase in training load with the impact of heavy bag hitting and jumping rope and sparring has brought a new obstacle,...I seem to hit a wall. I got to a heavy load of training then my joints just started killing me (knees, ankles, back, neck) is this just being 36 or am I missing some nutrition or what. I just hit a wall and couldn't train hard for about 10 days. Now I'm back and can train hard but I still wake with joint pain and stiffness. Motrin and celebrex are becoming my best friends as is ben gay. Anyway, does anybody have these issues at 36 or do I need to seek a sports medicine M.D.. What's everybody's experience with traing as you're getting older?