Fung took the time to sit with me and talk despite having a flare up of sciatica and being in pain.

Sciatica, I use to suffer from that. I finally fixed it by doing this

https://www.youtube.com/watch?v=Er0FNvTjUak

Maybe if he workout enough, he'll end up looking like this guy

https://www.youtube.com/watch?v=S5MKDcQ6u9I

I use to do it horizontally, but found out holding my breath for extended periods is not healthy. I use a pair of zoomer fins and hold it 5 minutes at a time, doubt I can hold it for more than a minute without them. He might want to start with the frog kick first.