Please choose the correct ending to complete the given sentence: Using the rowing machine: Two men are seen speaking to the camera in front of an exercise equipment. one man

Ending1: begins pulling the other man's hair while a dog watches on the side. Ending2: gets on and begins demonstrating how to use it. Ending3: begins moving the pedals while the camera continues to focus on the machine. Ending4: is then seen riding the machine while bouncing it up and down.

Answer format: ending1/ending2/ending3/ending4