Skinny legs need more exercise.
Lie on your side and keep your body in a straight line. Lift one leg and feel the tightening force on the outside of the thigh. Keep your body in a straight line and slowly lower your legs. Practice each leg 15 times, one group or so, 4-5 groups.
You can finish the above actions continuously, or you can choose to practice according to the current state of your legs, but no matter which action, you should stick to it and don't be opportunistic. At the same time, it will be better to cooperate with 30-45 minutes of aerobic exercise, such as running, swimming and cycling! Remember, our bodies will never deceive us, but they are also observing how we treat ourselves.