I do it with iMovie. Moreover, sometimes I rehearse some parts more times. Even more, you can upload the video and ask your friend to watch it. Probably one of

I do it with iMovie. Moreover, sometimes I rehearse some parts more times. Even more, you can upload the video and ask your friend to watch it. Probably one of the easiest advice to implement which improves quality a lot. Disclaimer: I was organizer of event series where ~12 speakers give 5 minute talks.