Like I said in a previous post, I have been doing kung-fu for only a few months now, and I love it but i find other styles really interesting too. At first I thought that cross training would only make me progress slower in kung-fu (cause every class I'd take in something else would be one I could of spent on kung-fu) but then, all the styles are based on the human body, so they all got similarities. I think cross training can only make you better in all your martial arts. (finally decided to work out muscle mass in a gym instead of choosing an other style (kick boxing), sadly don't have time to do all I want martial art wise, oh well, I'll just keep that idea in mind and start kick boxing later)