Resistance to an exercise can be increased when one can do several sets of more than 12 repetitions with the current weight. Thus, option C is correct.
What is resistance exercise?
Resistance exercise is the strength training that increases endurance and strength. It includes weight lifting and other physical exercises that build muscle strength.
Resistance during the exercise can be increased if one can do sets and repetitions with a certain weight as the muscles will be able to endure the weight against the force or the weights.
Therefore, resistance can be increased when one can perform several sets.
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