Frog posture: Lie on the ground like a frog and slowly open your knees to both sides, with thighs and hips at 90 degrees and thighs and calves at 90 degrees. Tighten your abdomen, don't climb to the ground, put your hands on the ground, focus on your hips, remember to focus on your waist or hands, relax your whole body, breathe slowly, touch the ground, and relax your crotch until the root of your crotch touches the ground, that is, you can feel the groin pressure when you lie down.
Precautions for lying on the frog: A. You can cover your knees with a blanket, because lying for a long time will hurt your knees. B. Pay attention to your body at a 90-degree right angle to your hips and knees. C, pay attention when pressing the crotch. When the adductor muscle of thigh is too tight and the hip joint can't be opened, not only the pressure of hip joint, knee joint and ankle joint will increase obviously, but also the lumbar spine will probably compensate the stress and produce lumbar discomfort. D, at first, the inner thigh must not stick to the ground. Take your time and do your best. Don't push, be careful of pulling. E, after a long time, I may not get up by myself, slowly.