Please choose the correct ending to complete the given sentence: BMX: Then there is another biker too, they're probably racing, they're going super fast down the track turning and hitting high bumps that make them go high up in the air. the track

Ending1: then starts to get crowded with bikers, they have to sit still getting a very intense workout and they're all wearing military outfits and and helmets. Ending2: is shown again and there's a man who's running on it going with 10 bikers. Ending3: runs with a steep incline initially while people watch and walk around the area, but the race finally starts they all faster than the others as they do not want to get ahead by running. Ending4: opens again and they start another race.

Answer format: ending1/ending2/ending3/ending4