Nailing young people!! Big-butt aunt's hip shaking exercise

Kazumi, who lives alone, receives a wedding invitation from a friend. So I wore a dress I bought for an invitation the other day, but the zipper didn't get caught in the butt area. In trouble, Kazumi decides to go to the gym until her wedding, tightens her hips and wears the dress she has purchased. <Yoga mats, balance balls, etc.> Kazumi works on all kinds of exercises. However, Kazumi's bold hip movements that don't bother her eyes from others unconsciously seduce the young instructor...