I also encountered the same confusion as this fellow traveler. When the foot leans back, the leg is slightly straight, the center of gravity is biased towards the sole of the foot, and it is difficult for the waist to lean against the wall; Standing forward, it is more than half a foot, and it is also for the back waist to support the wall, which is not standard. Please share your experience with anyone who has experience. Thank humbly!

In addition, it is best to lean against the door, the wall is cooler, or the door is milder.