An Athlete is:

According to Merriam Webster’s Collegiate Dictionary, an athlete is “a person who is trained or skilled in exercises, sports, or games requiring strength, agility, or stamina”.

The CrossFit definition of an athlete is a bit tighter. The CrossFit definition of an athlete is “a person who is trained for skill in strength, power, balance and agility, flexibility, and endurance”. The CrossFit model holds “fitness”, “health”, and “athleticism” as strongly overlapping constructs. For most purposes they can be seen as equivalents.