And exercise the big arm muscles.
Waist movement: lift your hips left and right, keep your upper body still and bend your knees slightly, but you can't exert force on your legs to eliminate waist fat.
Knee lifting exercise: inserting waist and lifting knee alternately. When one knee is raised, the heel on the landing side is raised alternately.
These three movements are simple, easy to learn, easy to stick to, and the head will not swing, so it will not affect the viewing.