Carbohydrates would be the macronutrient that serves as the foundation of fuel for athletes. Furthermore, carbohydrates comprise sugar, starches and other common dairy products. Carbohydrates are responsible for "burning" the fuel needed for our body to run and also for its metabolism.
Answer: Cardio
Explanation: Cardio exercises such as running, treadmill activities, and jogging strengthen the heart.
The answer to your question is “An action plan”