Yes! I've used various friends over the years but now I'm using friends who are professionals working in a gym in LA:

https://www.instagram.com/wilfredofitness/

https://www.instagram.com/krickithodges/

You are right though, it is very time consuming process and sometimes we get it wrong and have to go back and re-film. I have a pretty big backlog to edit and upload. It's a slow going process. Seeing this on HN has motivated me to do some extra work this weekend.