Please choose the correct ending to complete the given sentence: Tai chi: A background with text pops up briefly. a tai chi instructor

Ending1: begins a stance routine and is seen shifting his weight to either leg multiple times before briefly returning to his original stance. Ending2: instructs on how to properly perform a tai chi routine on a balance beam. Ending3: walks up to an exercise machine and grabs it. Ending4: then appears and instructs a group about walking the youtube links.

Answer format: ending1/ending2/ending3/ending4