|To improve strength and definition the exercise should activate the larger type II motor units and muscle fibers so the muscles should fatigue before twelve repetitions. For optimal development of strength and definition the rep range should be between six-to-twelve; if you can complete more than 12 repetitions, increase the weight.
When using heavier resistance for a fewer number of repetitions, the rest period between sets or between circuits should be longer. For example, an exercise with a heavy resistance for 6 repetitions should be followed by a rest interval of 1 ½ to 2 minutes.
When starting the program complete each exercise or stretch for 1-3 sets resting between each set before moving to the next exercise. To increase the intensity (burn more calories); turn the routine into a circuit and complete one exercise right after the other and rest for 2-3 minutes after the completion of one circuit (all exercises).