Please choose the correct ending to complete the given sentence: Using the rowing machine: A man is inside a gym while speaking to the camera. other men

Ending1: lay out a carpet and roll carpet in there. Ending2: ride bikes on front him and show back flips on. Ending3: join him as they gear up to go and run in a marathon. Ending4: are working out behind him.

Answer format: ending1/ending2/ending3/ending4