After my knee hurt following sprinting last week, I postponed my plans for sprints on Saturday and Sunday. That's still my goal, however.
This weekend, I only sprinted on Sunday. I jogged at the high school track a mile and a quarter to warm up, then I did 50-yard sprints--turning around and walking back to the starting line and immediately sprinting again.
This time, I was in a moderate sprint, rather than running like I was trying to win the Olympics. It seemed to be better on my knee; also, I didn't try to stop my self quickly after passing the 50-yard mark, figuring a quick stop puts stress on the knees as well.
My knee felt fine, but I started to feel a little pain in my left quad, where I think I had a small, small muscle tear last week. So I stopped after nine sprints, rather than going to all 10.
My hope is that 1) as the muscles build up, I won't get these pains as often, and I'll be able to start sprinting twice a week (Saturday and Sunday); 2) the sprinting will give me greater leg strength and endurance in sparring; 3) I'll be able to move constantly during sparring the way my sensei is urging us, making me competitive with the young black belts in class and leading me to become the world's greatest 53-year-old kickboxer.
Hey, a guy can dream, right? :-)