Exercise the larger muscles first . Don't over-train . Your body requires time to rest and build itself back up. Exercise at an intensity level that you can maintain rather than going full-force and wearing yourself out. Warm up before you work out .
Many trainers feel that the warm-up is as important as the workout itself.
Get the blood flowing to all parts of your body before you begin strenuous exercise. After a workout, stretch the muscle groups you've been working on that day. Stretching a warmed-up muscle is safer than stretching a cold one.