Personal trainer Adonis Hill gained nearly 5 stone to help his client lose weight.

He ate more than 8000 calories a day for 4 months, then he and his client Alissa Kane lost the weight together.

Adonis says he was overweight before he became a personal trainer and that "going back was scary".

Alissa says when she found out what Adonis had done, "I was overwhelmed. I didn't feel guilty until the moment I saw him big...I felt completely indebted."

It was filmed for the US TV show Fit to Fat to Fit.

This clip is originally from Phil Williams on Monday 22nd February 2016.