Sam Jackson made a name for herself as the motivated coach who keeps her clients on their toes - and after striking up an unlikely friendship with actor-client Mel Gibson, the two have been gym buddies ever since.
Now, her little black book of A-list clients continues to grow - with the personal trainer set to take on her biggest project to date, coaching the entire cast of a brand new major movie.
Legendary guitarist Kenny Wayne Shepherd - who is married to Mel Gibson's daughter Hannah - has also enlisted Sam's help.
Losing the dad bod
"You've got to know your waist circumference - it should be well under 100cm for guys," Jackson said.
"It's also important to watch your portion sizes as well - and avoid sugar, fats and alcohol. They're the three substances that'll make your belly fat grow.
"Don't do fad diets - they're just going to do you harm - and get some exercise every day because our bodies were made to move."
This article originally appeared on 7NEWS