school ground

I exercise on the school ground.

私は校庭で運動します

I exercise with a skipping rope on the school ground.

私は校庭で縄跳びを使って運動します

I exercise with a skipping rope for thirty minutes on the school ground.

私は校庭で縄跳びを使って三十分間運動します

I exercise lightly with a skipping rope for thirty minutes on the school ground.

私は校庭で縄跳びを使って三十分間軽く運動します

I exercise lightly with a skipping rope for thirty minutes on the school ground before lessons.

私は授業前に校庭で縄跳びを使って三十分間軽く運動します