I guess it may be that you have been sedentary and your hips and waist have been exercised.
This can easily lead to sagging hips, so don't worry.
Try not to sit when you can stand, and do as much exercise as possible, such as doing laps and sit-ups.
Massage the buttocks with Katz, and pay attention to the depressions on both sides of the buttocks and the middle part of the horizontal stripes of the buttocks with your thumb.
This is the part of the bladder circulation of the foot. Stimulating these parts can play a role in raising buttocks and enriching buttocks ~