As long as you keep exercising, the cocoon will get thicker and thicker. If you don't exercise, you will get better slowly. Generally, it will get better in about 5 days after stimulation. Don't grind every day, you can also wear gloves. There are many Taobao, which are not expensive. You can't get used to it. I've been practicing for three years, and it still hurts after being badly ground.