Kung fu is the result of ceaseless training. Do anything enough times, and you'll see results. So will you, once you fight in the Battle Hub 100 times.
Starting to get used to competition? Then set your sights on winning 30 Battle Hub matches. Gotta give yourself a challenge if you want to get anywhere in life.
I've worked a few odd jobs during my travels, and they all helped me with my training. You should take up a part-time job during your World Tour, as well.
Something in the way while you're walking through the city? Here's an easy solution: send it flyin' with a Master Action! Mm-mm-mmm... It's the little pleasures in life.