Resistance exercise, also called strength training, is defined as any activity that involves muscular contraction against an opposing force (caused by an external weight).When you do resistance exercise, you are essentially performing specific movements using an external weight which produces an opposing force to your muscles. As you perform these specific movements, the forces of the weight cause your muscles to contract in order to control the external weight. As you perform regular and consistent exercise, your muscles will adapt to the new demands placed onto them by the actions of controlling the external weight and as a result you will become stronger, move better, and will increase your overall endurance. This is essentially the SAID principle, which stands for Specific Adaptions to Imposed Demands and is a general principle of resistance exercise. Regular resistance exercise trains you to stay strong and optimizes your metabolism over a long period of time (over a lifetime).
Examples of resistance exercise in daily life
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