I wanna say one thing, the best way for be a good riding is ride in natural, roks and roks, if you are good in natural, the street will be very easy for you later. but obiously, you must to know if you wanna do street trial or natural trial for win championships and have a good control in your bike. however you can do both trials, but i think is better do more natural than street, but street is fine somedays too. Sorry with my shitty english...