If you positioned the light a little higher I wonder if that might have lit her face a little better. I might suggest higher and angled down a little. Only a suggestion though.
Good thing that she's in shape. Is she in gymnastics or some sort of martial art?Too bad about the bad crop and the lighting is kind of harsh, especially on the wall behind her. Try shooting this kind of stuff with more ambient light so that the flash effect won't show so much. Black and white works well here.
I really like the pose, the look on her face. I think the choice of b/w was a good decision. The lighting on her body works well also. I don't like the bright spot on the wall behind her and I wish the image were bigger.