Question is too vague. There are *Seven amazing yet different sports that fall under the umbrella of the term "Gymnastics"* Not all of them include balance skills; for example Trampoline & Tumbling Gymnastic and Group Gymnastics require no balance skills.
* Gymnastic Sports
Artistic Gymnastics Men's
Artistic Gymnastics Woman's
Group Gymnastics
Aerobic Gymnastics
Acrobatic Gymnastics
Rhythmic Gymnastics
Power Tumble and Trampoline Gymnastics
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