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Using your Treadmill will improve this. MUSCULAR STRENGTH – the ability of a muscle to exert force for a brief period of time. Upper-body strength, for example, can be measured by various weight-lifting exercises. MUSCULAR ENDURANCE – the ability of a muscle, or a group of muscles, to sustain repeated contractions or to continue applying force against a fixed object. Push ups are often used to test endurance of arm and shoulder muscles. FLEXIBILITY – the ability to move joints and use muscles th