Gradually increasing resistance, increasing repetition, increasing sets are examples of which principle?

Resistance training.

Explanation:

Resistance training is based on the principle of gradually increasing resistance, increasing repetition and increasing sets to acquire resistance. Resistance training refers to those physical exercises which are designed and done to improve strength and endurance of the body. Resistance training uses the principle of repetition of a particular exercise in order to attain strength as well as resistance against diseases.

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

your answer is c! hope this : )