Please choose the correct ending to complete the given sentence: Using the rowing machine: Man is sitting on a maching doing exercise. man

Ending1: is working out taking a regular steps carving a triangle in the floor. Ending2: start pumping the pucks. Ending3: is doing pectoral exercises on a gym wooden room. Ending4: take the boxer's bag and turn it and hangs it on a wooden man's shoulder.

Answer format: ending1/ending2/ending3/ending4