Travis Pastrana, the original moto x innovator just to do high school physics, using free body diagrams for most of his stunts ack in the day. They also have courses at home that have the exact same jump with a type of air cushioned ramp to help with fall while perfecting it. When you see these guys perform it in front of people they can do it it literally 99/100 or better on the practice ramp before attempting it on a ramp without the safety guards never mind in front of people.
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