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What does physics have to do with weight lifting?
Physics is the study of motion. Weight lifting includes many concepts of physics. Weights are heavy due to their mass and the force of gravity acting on them. Your muscles apply forces on the weights that oppose gravity to lift them off the ground. Weight lifters often have to bend their knees and elbows to lift the weights. This involves the physics of torque, which is the rotational force your muscles exert to bend your joints.