This practice is quite fast. I weigh about 55 kilograms. Well, if it's not winter, if you wear less in summer, you should be able to practice in about a month. Winter is very, very hard, although I don't wear much. In fact, only add a few pounds, because the thickness of clothes will affect the strength of arms, the bending of arms, etc., which may make you feel very difficult to pull up, if you wear thin clothes or vests in summer. This is still an easy book. As long as you take it two or three times a day and wait for a person or so, you can quickly hear whether it is a big problem to improve 10. Of course, it may be harder for you to reach 20. Exercise lies in persistence, which requires hard work every day. You can't wish you health and success overnight.