The only thing stopping you is you. While I understand its hard that your parents won't support you, it has to be up to you. Even if you can't tumble 5x a week, you can do one thing, which will help you all around, so if you ever get the chance, you'll be ready. Condition! Strengthen your muscles, and do all you can to get your strongest.
Next, if you can, go to a trampoline place! The strips are similar to Tumble Traks (way flimsier, but whatever), and you can tumble on them! Even if you don't want to try a BHS on the trampoline yet, most places have foam pits, which you can try doing skills into. Be careful though, the pits there aren't meant for tumbling into, and aren't as deep. And, if you bring a friend who can tumble, and who wants to help, it's like a private lesson.
But conditioning is soooooo important. It's a sport, and you have to take it seriously. Nobody owes you anything. They won't be chasing you down the street, telling you to run. They don't have to. You need to do things for yourself, because it will help.
But--Make sure you pay attention to detail as well. It'd be terrible to get a skill then have to re-learn the technique.
Good luck!
Ohhhhhh and also, I just saw a new thread posted. It was titled "Paying Dues **Coaches and Parents**" if you look that up, there's some good info on a program that could help you pay for some lessons and stuff!
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