Action 1, lying flat on the bed with two feet on the empty seat can exercise your calves and thighs.
Action 2: Lie flat on the bed, with your feet shoulder width apart, your crotch (that is, your buttocks) lifted upward, and your shoulders and heels kept off the ground, so that you can exercise your buttocks.
These two movements can be done until you can't sit still. This is the secret book of Xiao S, but it will take at least 3 to 6 months to see the effect.
You can try, save money and effort. I hope you can use it well.