What's the best treatment to make my waist smaller? I'm not over weight but my mid section is straight up and down (Photo)

you are very thin so be careful with overly aggressive liposuction.  In your profession even the slightest contour irregularity can be a big problem.  

Dear sarahFrom the photographs, properly directed liposuction can help create a longer torso shape and break above your pelvis and can improve the shape of your waistline elongating your mid-body. Unfortunately, there will be down time and as you know well, modelling is hard physical work, you will need 3 weeks or so to recover to be able to go back to work. Best of Luck!!

If the photograph provided is your own I don't really think there may be any therapy available. If you pinch an area and there is less than 1 inch between your fingers liposuction will probably have no benefit. Outside of liposuction any other body contouring therapy is probably worthless.

Hello, Thank you for your inquiry. In case of liposution surgery, it is not only good for reducing fat but also suitable for sculping body shape. The most common concern among patients who are in normal weight range is unfavorable and unbalanced body shape. The liposuction procedure can be done partly to dissolve concern. After the liposuction surgery procedure, you are required to wear compression garment which is designed according to your body size to fix your surgical site. Thank You