Which of the following is one of CrossFit's ten fitness domains?

• A. Balance
• B. Reaction time
• C. Proprioception
• D. Posture

Answer: (A)

Balance is one of CrossFit’s ten general physical skills. It means the ability to control the body’s position in space and maintain a stable center of gravity over the base of support during both still holds and dynamic movements. This skill underpins performance across many movements, from gymnastics to weightlifting to running, because good balance helps you stay stable, transfer force efficiently, and reduce injury risk. For example, tasks like a handstand, a pistol squat, or maintaining stability on a moving surface all rely on balance.

Reaction time is about how quickly you respond to a stimulus, which isn’t listed as one of the ten general physical skills. Proprioception is the sense of joint position and awareness in space, which supports balance but isn’t named as a separate domain in the framework. Posture refers to alignment and positioning, which affects performance but, again, isn’t one of the ten domains on the official list.