What cellular interactions are the result of their training, allowing for improved athletic performance?

increased muscle mass - increased mitochondria - increased cellular respiration - increased ATP

Explanation:

The human being, in his concern for the body, must be alert to the fact that health and longevity must be accompanied by quality of life, both in the present and in the future. Physical activity is an essential ally to achieve good physical shape and its practice must be developed in a pleasant and continuous way throughout life.

That physical activity is beneficial is no secret to anyone, however, training with the objective of preparing the body to have a good athletic performance causes cellular interactions that allow the increase of muscle mass, increase of mitochondria, increase of cellular respiration and increase of the ATP.

decreased mass - less energy needed for movement - less carbohydrates required - more available ATP

Explanation:

Solution; Increased muscle mass in athletes will increase the number of mitochondria in body. Mitochondria provides energy to cells of our body so more mitochondria will results in more energy and due to large amount of energy there will be increased cellular respiration and less fatigue, thus athletic performance will be improved.