Please choose the correct ending to complete the given sentence: Kneeling: Two men are at a gym to demonstrate proper form for the exercise. the man in the black shorts

Ending1: is demonstrating ways to lay a slack line. Ending2: gets on one knee as the instructor gives instructions on what to do. Ending3: is demonstrating the aerobics routine part of the exercise class. Ending4: begins to do some electrical exercises.

Answer format: ending1/ending2/ending3/ending4