A teen boy rides a bike down a desert trail and goes off a jump. He lands and then crashes into his dad at the end of the trail.
Boy rides bike / bicycle off a jump in a woods, flies off his bike and smashes into a tree.
Man tries to ride mountain bike off a ramp in the woods, he crashes and lands on his face. Then the bike hits him in the head (he has a helmet on).
A group of people mountain bike down a hiking trail and jump off dirt ramps and the fourth person flips over and falls.
The camera man rides a bike through the woods. He crashes down a small hill and groans.