Allow at least one day between weight-training sessions to let your muscles recover. Proper recovery will help you build strength faster. In 1990, the American College of Sports Medicine added strength training to its list of exercise guidelines, recommending that people do at least two sessions a week. Make sure not to work the same muscles on two consecutive days. Flexibility Flexibility, sometimes called the forgotten fitness factor, refers to the range of motion in joints.
Flexibility depends on the condition of muscles that control a joint.
If muscles are too taut, the joint fails to move through its full range. As people age, they tend to lose range of motion. Inactivity can contribute too. If you're out of shape and inactive, you often may feel stiff or have trouble moving, bending, and straightening. Exercises to improve flexibility can help you bend, turn, and reach more easily.