Cameron Diaz is showing off incredible arm muscles these days. She's "ripped!" It turns out she's been training like crazy with her boyfriend, New York Yankees star Alex Rodriguez!
Sainsbury tells McInerney the secret to great arms: "Work!" he says.
Sainsbury and McInerney tried out a tug-of-war exercise Diaz was photographed doing with A-Rod.
Another exercise Diaz did was hoisting a tractor tire, but Sainsbury says that is not the safest way in the world to exercise.
"It can be very dangerous," he told McInerney.
Instead, he demonstrated an alternative exercise that yields the same results as the tire hoist.
Diaz and A-Rod also did "slant" exercises and believe it or not, he gave up on the workout before she did!
The "slant" is a full body exercise and it wears you out quickly.
Sainsbury says to hold the pose for about 30 seconds.
To find out more about celebrity trainer Chris Sainsbury, click here.