Respuesta :
Answer:
D. overload
Explanation:
The overload principle is concept used in sport fitness. The principle states that athletes must continually work harder and the exercises and trainings must become more challenging in order to improve, because their bodies adjust to existing workouts.
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Exercise is the activity requiring physical effort, carried out to sustain or improve health and fitness.
The principle of exercise that is concerned with maintaining a challenging workout is overload.
Importance of exercise-
Exercise helps people to lose weight and lower the risk of some diseases. Exercise can also help to keep you at a healthy weight.
Exercise regularly and balancing your lifestyle accordingly is very necessary for a healthy life.
Therefore, the correct option D is Overloading or working hard for maintaining a challenging workout.
Learn more about the Exercise here:
https://brainly.com/question/1052256