Training Sets: One Set Per Exercise
One study (Westcott 1995a) found one-set and three-set training to be equally effective for increasing upper body strength, and another study (Starkey 1994) found one-set and three-set training to be equally effective for increasing lower body strength. If training time is limited, it is good to know that single-set strength exercise is just as productive as multiple-set workouts.
Training Resistance: 75 Percent of Maximum
The exercise resistance should be high enough to produce a high rate of strength development and low enough to pose a low risk of injury. Empirical evidence clearly indicates that using 75 percent of maximum resistance meets both of these training criteria.
Training Repetitions: 8 to 12 Reps Per Set
Research (Westcott 1993) indicates that most people can complete 8 to 12 controlled repetitions with 75 percent of their maximum resistance. Generally speaking, if you cannot perform at least 8 repetitions the resistance may be too heavy, and if you can complete more than 12 repetitions the resistance may be too light. Working within the 8 to 12 repetition range is recommended for safe and effective muscle development.
Training Progression: 12 by 5 Rule
Every strength training program needs a protocol for progressing to heavier weightloads. While it is important to periodically increase the exercise resistance, it is equally important to do so gradually. A safe and productive progression is known as the 12 by 5 rule. That is, whenever you complete 12 repetitions of an exercise in good form, you increase the resistance by 5 percent or less. The 12 by 5 procedure provides small but frequent training increments to progressively stress the muscular system.
Training Speed: Six-Second Repetitions
Unfortunately, there is little consensus on the best training speed for strength development. However, research indicates that slow movement speeds may be preferred over fast movement speeds, because they produce less momentum and more muscle tension. At 6 seconds each, 8 to 12 repetitions requires about 50-70 seconds of continuous muscle effort, which provides an excellent anaerobic stimulus for muscle building. We have obtained consistently good results training with 6-second repetitions, taking 2 seconds for the harder lifting movement and 4 seconds for the easier lowering movement (Westcott 1995b).
Training Range: Full Movement Range
Research (Jones 1988) indicates that full range muscle strength is best developed through full range exercise movements. In other words, the training effect is greatest within the exercised portion of the joint movement range. Full range strength reduces injury risk and increases performance potential. Try to perform each repetition through a full range of movement, but never to a position of discomfort.
Perhaps the most important aspect of a well-designed strength training program is to address all of the major muscle groups. A comprehensive training approach produces overall strength development and reduces the risk of muscle imbalance injuries. The recommended exercises and target muscle groups are: