The first action: stretching the iliopsoas muscle. Kneel on one knee on the floor, then keep your upper body upright and look ahead. Then press the bottom down to make the front side of the thigh feel stretched. Do two groups every day for about 30 seconds on each side. If kneeling on the floor hurts, you can put something soft on your knees.
The second action: stretching the quadriceps femoris. On the basis of the last movement, lift the straight calf, then hold it with your hand and lean against your ass to feel some stretching feeling. If you can't stand up, you can hold the wall or chair. Stretch your side waist and thighs, and keep breathing evenly all the time. This action is twice a day for 30 seconds on each side.
The third action: stretching the waist, hips and legs. Straighten one leg, bend the other leg, then stretch up and lean to the other side, stretch while breathing, and hook your toes with your hands. Don't stir up your shoulders, your legs should feel stretched, and your body can lean forward slightly.
The fourth action: reverse stretching hips and legs. One leg is straight, the other leg is bent, and then the ground is supported with both hands, and the body remains upright. Keep breathing evenly all the time. If it is easier to do, you can also try to lift your straight legs and hold them with your hands, so that you will feel more stretched.