I'll introduce you to a good method.

Skinny leg exercise

Body prone on the ground, arms straight, supporting the upper body, toes on the ground, heels raised. So that the waist, legs and hips are tilted and the head is looking at the ground. Action duration 10 second.

Abdomen and thin thighs

1, lie flat on the ground, touch your ears with your fists, or hold your head. Raise your head and put your legs together so that your calves are parallel to the ground and your thighs are vertical to the ground.

It will be very effective to stick to it like this. Article source

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