Man! I just wish I was your height!! Keep it up. I know with running and joint issues for me its usually because I have gained a little weight. I tend to push hard in country for both mission, team and me and so I can eat and drink like sh*t when I am on leave. After a rotation I start to feel the wear and tear in my lower back and, of all places, in my forearms. That would be from gripping the bars in the gym and pull-ups. I did make a bonehead, rookie mistake last night. I didn't warn up thoroughly before bench. Did 135 for 10 reps and jumped to 315. Second rep in, I thought I had torn a pec....No discoloration so I went to shoulders and continued the lifting. I came back to bench, put 275 on the bar and pushed it a few times with no issue, just tenderness. Listen to your body!!!! Always warm up especially shoulders! I ended icing the area most of the night and taking 800mg of motrin. I guess I need to be more careful and not ego-lift!