Please choose the correct ending to complete the given sentence: Using the rowing machine: A young woman is in a gym. she

Ending1: sits on an exercise machine while speaking to the camera. Ending2: is performing, lifting bar, and lifting a barbell in the air. Ending3: throws a frisbee for a dog that catches it. Ending4: is swinging from a pole.

Answer format: ending1/ending2/ending3/ending4