I haven't practiced meditation for a long time, but now I can practice it steadily for about an hour. When I practice, I will wear earplugs to prevent the interference of external sounds, and then I will relax and start to observe my breathing. When I pay attention to breathing, I will feel the subtle feeling on the tip of my nose and silently count the number of breaths in my mind, from one to twenty and then start from the beginning. Not so distracting. As for leg numbness, I have never encountered such a situation. Maybe the subject's posture is wrong? However, the solution to this problem is mentioned in the book. When you feel uncomfortable with your feet, you should face this feeling, observe it and feel it until it disappears.