Power is achieved through explosive movements such as plyometric exercises and through interval training. Short intervals included in a workout 1-2 times per week will provide the acceleration a summer of long miles has taken away. Utilize a watch timer and heart rate monitor to gauge effort. Plyometric exercises include a loading phase followed by a propulsive unloading phase. Plyometric exercises should not be done when sore or injured, and an adequate level of strength is necessary to perform correctly. Again, seek advice from a physical therapist or personal trainer prior to adding power training to your off season program.