Please choose the correct ending to complete the given sentence: Tumbling: Woman is practicing somersaults on a roofed gym and women behind her are watching her. in the background

Ending1: they are in the gym doing various karate moves. Ending2: a gymnastic coach is giving instructions and the gymnast is jumping on a platform and doing flips. Ending3: a woman is doing ballet moves by herself. Ending4: people are practicing gymnastics and moving the mats.

Answer format: ending1/ending2/ending3/ending4