Maximum strength is ideal for athletes wishing to increase their overall strength and pack on more lean muscle. Max-strength workouts consist of four to six sets of one to five repetitions. Lifters should be lifting 85 to 100 percent of the one-repetition maximum in order to get the best benefit from these workouts, and they should rest three to five minutes between each set. (U.S. Air Force photo by Tech. Sgt. April Wickes/Released)