How do you define athletics?

Generally, being athletic means that you have the physical capability to run fast, jump high, outperform your opponent, etc. You could be participating in a physically demanding sport like Basketball and still not be entirely athletic. Shaquille O'Neal would be a fine example of that; he is very strong and muscular, but not that athletic. Those who are athletic have more stamina than others, as well.

The adjective 'athletic' means:

1) practicing and competing in games requiring physical fitness and skill or connected with such games; sporting

2) practicing and competing in Track and Field

3) physically fit and able to perform arduous tasks without fatigue; muscular; brawny