Do it in groups according to leg strength.

Always do ... every day

exhaust

After the leg strength is enhanced,

Straighten one leg.

Parallel to the ground

Do squats with one leg

You may not have a good balance at first.

Hold the table or chair first.

Do it alternately. Legs: first find a ladder or a book to pad your feet, then put your toes just on it, and your heels are not allowed to touch the ground or the mat.

Lift your toes to the highest point, and then slowly put them down.