Answers: honestly mate if your son is getting into freestyle and your asking this question-GET HIM OUT OF IT!
if you are asking this interrogate you obvisouly dont no anything about freestyle and dont no how and what tricks and stop him from getting hurt.
you should run to a club or your mechanic and discuss it and they can hook you up with everythign you need-learning tricks-building the ramp (which also will set you spinal column $3000) and everything.
the down ramp- depending on your son's skill for a beginner- around 3 metre's away and then so on.
8 foot is a resnible size for a begginer surrounded by fmx.
also your son has merely probably seen freestyle on TV and thought hay i can do that.
Best to start next to earth ramp, no problems with grip, effortlessly re-shaped, (slightly) softer to land on. Eight foot might be a bit daunting.
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