Why is it better for human muscle cells to produce energy through aerobic respiration?

First of all, an efficient respiration system is vital for ALL sportspeople, not just some. But it is vital because your muscles need oxygen to continually perform at a high level. When you engage in physical activity such as a sport, your muscles fatigue and lose oxygen which needs to be replaced in order for you to be able to keep playing. An efficient respiration system transports oxygen quicker to the muscles then an average respiration system does. But sportspeople do certain drills and running to improve the respiration system, typically called cardio.