Mastering of law of gravity is a excellent Reading.It is about the someone who is very famous and sucessful in the things that he has done.Althouth i do not like the martial art neither that kinds of movies, i have to reconigze thatYuen Wo- Ping is a big master, he knows to do his job.My comment is not extensive, it means i do not have enuugh words what to say, i do not have knowledge about it, but i only know something that a lot of people like to practice it and they enjoy a lot the movies, especially of Jackie Chan, who is one of the most favoritector in martiar art.I have heard the people´s comments about him ,they say he is very good actor and his movies are interesting.So finally,  if i decide to watch one i would like to watch one of Jackie Chan.