hello everyone i'm sure this has been posted before, but here goes.my boys have been racing flat drags all summer and i think there interested in motorcross racing,so before i throw them out there i would like to build them a practice track.any help in the design or idea's would be appreciated.we raced a motorcross this past weekend and they rolled through the jumps instead of jumping them like the other riders but they need experience any help would be great.thanks in advance

 

Try this:

http://www.dirtwurx.com/main.cfm