premise1: A guy on a bike goes vertical near a ramp with a grassy, hilly terrain behind him.
premise2: A boy doing a bike trick is in midair waiting to come back down.
premise3: A bicyclist is in the air over a ramp.
premise4: A bike rider on a ramp.
premise: A guy on a bike goes vertical near a ramp with a grassy, hilly terrain behind him. A boy doing a bike trick is in midair waiting to come back down. A bicyclist is in the air over a ramp. A bike rider on a ramp.
hypothesis: A rider makes a jump.