Is there a surgery that can reduce the waist size a couple of inches?

To reduce your waist circumference, liposuction can help as long as you don't have loose skin or weakened ab muscles (in which case a tummy tuck would be better achieve your goals). This will give you an hourglass figure. 

Without any photographs it is impossible to comment specifically about your situation. However sounds as though you're fairly fit and I don't see how an operation to narrow the waist such as a modified abdominoplasty makes much sense.

waistline can be narrowed if there are so-called stubborn fat pockets. if there is muscle laxity instead then its best to do exercises. I have performed this procedure in many patients who are good candidates and it looks very nice actually

An in person consultation would be necessary as we don't know anything about you or your anatomy.  However, liposuction in the right candidate can have fantastic results and skin the waistline.  Good Luck.

If you have bulging around your waist, even a small amount,liposuction could be beneficial. However, I am not sure whether you mean your waist circumference or its placement relative to your hips. If you are short waisted by anatomy, this is something you have to live with.

Waist size is determined by your anatomy- your underlying bony architecture and musculature as well as the fact content over these structures.

By waist I assume you mean the circumference of the smallest measurement of your abdominal torso.  If you mean diminishing the lateral contour of the waist by pulling it in 2 inches the answer is probably no, but it can be improved especially using laser assisted liposuction which has the ability to tighten the skin.  If you mean 2 inches from the circumferential measurement all the around that is much more possible.