It really is a rewarding thing to get into. I've been doing Ninjutsu for a little over a year now and am starting to get a natural feel for it, as in am outside my head a lot less and can use techniques more fluidly, and it feels really good! I have so much energy after class, and even the next day I'm still on a high. It's one of those things that you have to stick out to make any real progress though, as are most things but you can't really take time out of training and then expect to get back into it and take it where you left off. It really is worth it though when you get your gradings, or it is for me anyway not everyone is as bothered about the belts, but I am always proper chuffed on grading day.