If you just want to look at it locally on your machine, after it is rendered play the rendered animation (Ctrl F11) and then press “p” inside the playback and it will ping-pong (hence the ‘p’)
If you want to do it in a more permanent fashion, add your forward clip to the VSE and then duplicate it and in the properties panel, under ‘filters’ click ‘reversed’.
Then render out your loop or duplicate the 2 strips as many times as you need.
