Lie on your back with your knees bent and your feet on the floor. Spread your arms wide in a T-shape so that your shoulders are grounded to the floor. With your legs together, slowly lower your knees to the left side as far as they can go.  Hold this position for two minutes. Concentrate on keeping both of your shoulders down on the floor during the stretch. Repeat this stretch for the other side by bringing your knees up to center, then lowering them down to your right side. Keep your shoulders on the floor and hold for two minutes on this side. Lie on your back with your knees bent and feet on the floor. Straighten your left leg and bring it straight up, concentrating on reaching your heel toward the ceiling. Bend your knee and bring your foot back to the floor.  Do 6-8 reps of this stretch on your left leg. On the last rep, hold your leg straight with your heel toward the ceiling for 30 seconds. Repeat this stretch on your right leg. Start on your hands and knees. Bring your left knee up toward your chest and lower it to the ground with your foot going toward your right. Bring your right leg down to the floor so that it’s straight back behind you.  Your left leg should be at about a 90-degree angle under and in front of your torso. Slowly bend your torso forward to feel the stretch in your glutes and your hips. Go as low to the floor as you can, putting your forehead to the floor if possible. Hold for about 5 deep breaths, then switch legs and repeat on the other side. Lie on your back with your knees and feet up at a 90-degree angle in front of you. Cross your left ankle over your right knee and flex your left foot. Bring your hands through and grab the back of your right thigh, pulling back with both hands as far as you can.  Hold this stretch for 30 seconds, then switch to the other side and repeat on your right leg. For an added stretch, roll up a towel and lay it under your hips during the stretch. Start on your hands and knees with your hands directly under your shoulders and your knees directly...

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Write a summary of the previous text in Chinese:
双膝弯曲扭转。 伸展你的双腿和肌腱的后侧。 用鸽子式姿势伸展你的臀部。 试试图4所示的伸展动作。 利用摆尾伸展来拉伸你的背部肌肉。