Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A short intro video appears with people playing various sports. the video

Ending1: timults to show a rubix cube, followed by a man talking about different strategies there are for solving rubix cube. Ending2: seems to be about a video game called playa con tuehl, and the words wipicson new jersey appear on screen. Ending3: then goes into tennis and a tennis player explaining his technique. Ending4: is about how to break down an ice hockey ball.

Answer format: ending1/ending2/ending3/ending4