Different muscle activation methods are used to minimize injury and assist in the development of muscle strength. A balanced exercise program incorporated in the exercises can involve these types of loadings:
1. Isometric contraction
2. Concentric contraction
3. Eccentric contraction
Isometric contraction is when the muscle contracts without any change in the length of the muscle, it is just a sustained activation of the muscle. Isometric contraction puts less stress on the body and therefore can be used immediately after the injury.
Concentric contraction is when the muscle is shortening or contracted e.g. when the individual lifts the hand to the shoulder while bending the elbow, the biceps are shortened. Concentric contraction is a common action of our body during most sports movements.
Eccentric contraction is when the muscle sustains its contraction while the muscle is lengthened e.g. the biceps is lengthened when the elbow is straightened while muscle tension is sustained. Muscle bulk is developed at a greater rate by eccentric contraction.

Technique and control
Exercise is a challenge and knowing the best technique is another big challenge. One of the big reasons for injuries related to strength training is usually poor technique or lack of control. An individual should always seek advice from his physiotherapist on how to perform the exercises.
Also performing the exercises at different speeds with control is another important element.  Especially while starting an exercise with an appropriate weight that an individual can control with proper technique. Once the control is achieved weight or speed can be increased
The exercises begin with easier movements and progress as strengthening is developed. Strengthening exercises are effective when the muscles are overloaded. Some of the exercises are:
1. Exercising against gravity
2. Exercising against the resistance of water
3. Exercising against a resistance band
4. Exercising with weight
5. Exercising using your body weight as the load