Jumping jacks.

"Jumping jacks," you say, grinning evilly at her. "I want to see you sweat."

She growls in inarticulate rage and does as you command. Her hair flies freely around her face and her small, dark-nippled breasts jiggle and bounce as she cavorts for your entertainment, spreading her legs rhythmically and raising her arms as high as they'll go. One of the other gypsies begins to beat a drum, keeping time with her jumps. You walk in a slow circle around her, appreciating the way the muscles of her buttocks flex and strain.

Very satisfying. What else could you have her do?