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muscular strength is defined as the maximum amount of force that a muscle can exert against some form of resistance in a single effort.
Sets and reps are the terms used to describe the number of times you perform an exercise. A rep is the number of times you perform a specific exercise, and a set is the number of cycles of reps that you complete.
sarcopenia is the loss of muscle tissue as a natural part of the aging process.
Variable resistance training is the use of varying degrees of force to a particular muscle while working out. An example of variable resistance training is using a deltoid exercise machine at the gym