Final answer:
In ballet, 'Rond de jambe à terre' involves circular movements on the ground with one leg. It enhances the strength and flexibility of the muscles for maintaining good posture and control in dance.
Step-by-step explanation:
Rond de jambe à terre is an exercise in classical ballet that involves creating circular movements on the ground with one leg while maintaining good posture.
This particular exercise aids in strengthening the muscles used for lowering the sole of the foot to the ground, as when foot-tapping or jumping, and it also helps with maintaining posture while walking. The movement consists of brushing the foot along the ground to describe a semi-circle and serves to improve flexibility, control, and the gracefulness of leg movements required in various aspects of dance.