Notes

Continuing the theme of trios from the prior question, the cardiovascular, respiratory, and endocrine system all support the body in the act of exercise. The cardiovascular system exchanges oxygen for carbon dioxide via veins and arteries. The respiratory system breathes in the air and separates oxygen from the other ~79 percent of gases in the lungs. Finally, the endocrine system secretes hormones into the body affecting it in a variety of ways. Starting, there is a clear connection between the cardiovascular and respiratory system; the respiratory provides the oxygen for the cardiovascular distribute. Relating to physical activity, oxygen is needed for organs and muscles to function. This connects both prior systems to the impetus of the human body. Concerning the endocrine system

While not a sport I have ever participated in, a relevant one nonetheless: free solo climbing. In such, a singular daredevil ascends a cliff face without the assistance of tools such as rope, harnesses, etcetera. The climber has nothing more to rely on than their own strength, mental fortitude, and luck. Torturous for some, thrilling for others. Relating back to the prompt at hand, free solo climbing uses all of