Definitely agree that the pose is not great here, so I'll just leave my pose-related comments to that.
The lighting: I feel that the lighting here is pretty good, fairly even, and you captured a good depth and amount of detail in her body, which is absolutely key in my mind when it comes to fitness models. So that's definitely good. Although, I do agree with Kundalini that the light might be a bit too much on her right arm and hip. And I also agree with Nate in regards to not quite enough light under her chin. Overall though, the lighting gets its purpose accomplished, and gets it done quite well.
Overall: The shot isn't poorly done, but the posing really puts a damper on the shot as a whole. I would suggest a reshoot to nail a better pose out. The lighting is darn good though, so I wouldn't worry about making huge adjustments on how you lit the shot, at all. Pretty good stuff.