Every night, one hour before going to bed, lie flat on your cot and do pedal exercise. ...

Exercise:

■ Lie on your back with your hands at your sides. Palm down.

■ Bend your knees, retract your legs, and lean against your abdomen.

■ The right leg is straight forward, basically parallel to the ground, and the left leg is stretched and flexed.

Legs alternate, just like pedaling a bike. When one leg retracts, the knee should be as close as possible to the abdomen and try to draw the largest circle. Pedal 10 turn. After pedaling, put your arms around your knees and relax 10 seconds.

■ Slow down in the opposite direction, 10 turns from bottom to top. After pedaling, put your arms around your knees and relax 10 seconds.

■ Two directions count as a group. You can kick 2-3 groups at the beginning, and then you can gradually increase the number of laps and groups according to your physical condition.

■ Remember to relax after pedaling in every direction. This will help you regain your strength.