According to the principle of overload you should

Answer choices are:

a. gradually increase the difficulty of a workout

b. gradually decrease the difficulty of a workout

c. engage in challenging exercise during workouts

d. vary the exercises in a workout over time

Correct answer choice is:

A. Gradually increase the difficulty of a workout.

Explanation:

Overload and progression are two fundamental training principles. Overload indicates the measure of load or resistance, contributing a higher pressure, or load, on the body than it is usually accustomed to in sequence to enhance fitness. For example, if a soccer player's aim is to enhance upper body power, he would proceed to develop training weight loads in top body workouts till his purpose was accomplished.

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hope this my dude and can i get brainliest : d