Not playing Highschool sports. I pole vaulted 2 seasons and played football in 8th grade. I never was much for team sports. I see all these guys in their mid-late 20's come in to class who do a roll or 2 and take a break, 5 minutes later they can barely get up off the mats. I hear stories about dudes that have had multiple knee surguries starting when they were like 16. I will never regret not playing football(im from Texas, not playing football is a big deal for a kid who's 5'11 180;bs and can run a 4.6 40 when your in highschool). My back is fine, my knees are fine, I have a little bursitis in my left shoulder) Im just glad I didnt destroy my body before I found Jiu Jitsu.