Write the next sentence in this paragraph:

An ad for a gopro appears on the screen. Several people are on a beach, and they shake hands in greeting. they

pick from the following.
- warm up, then start a small game of volleyball.;
- then are shown water boarding through hard poolside streets.;
- are then running down a track.;
- swim then do a hand stand.;
warm up, then start a small game of volleyball.