IPA: /æθˈlɛtɪkli/
KK: /æθˈlɛtɪkli/
In a way that shows physical strength, skill, or fitness, often related to sports or physical activities.
She runs athletically, easily keeping up with the fastest runners in the race.
Athletically → It is formed from "athletic" (from Greek "athletikos", meaning pertaining to athletes or athletic contests) and "-ally" (meaning in a manner relating to). The word "athletically" means in a manner that pertains to athletes or athletic activities.
Think of 'athletic' relating to athletes and the '-ally' indicating a manner. So, athletically means doing something in a way that relates to athletes.