Translation of "Workout" in Japanese

This is gonna be a workout on the arms. Okay.

腕(うで)の運動(うんどう)になる よし

My sister is old enough to go to a workout studio by herself.

妹は一人でエアロビクスクラスに行ける年齢だ。

"If it's a light workout, OK." "Right, so will we allow crotch-kicking and eyeball crushing?"

「軽くならいいけど」「うむ、では金的と目潰しは有効にするか？」