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