It's hard to say that you won't gain weight after sitting for a long time, but you will gain weight after sitting for a long time. After eating, you can hold the wardrobe and other high objects and stretch your legs back and forth, which can accelerate the burning of fat, and also help stovepipe and tighten your hips. If you want to keep a posture, you have to sit up straight. Don't lie on the sofa or bed at will, it's easy to get fat.