Three sets of eight reps on each side, with a minute rest between each set.
• Start on your back, with arms fully extended and legs at a right angle. • At the same time, swing left arm above your head, and extend right leg, using core muscles to keep yourself from twisting your body. • Hold for one-two seconds. • Return to the original position and repeat on the opposite side.
“My whole week is planned to the minute – where I have to be and what I have to eat,” says Magnussen, whose ambassadorial role for luxury watch brand Maurice Lacroix must surely come in handy. “I have seven swim sessions, three weights sessions in the gym and two Pilates sessions. When I'm fully fit, I swim 30km a week, and in the off-season that doubles to 60km. I enjoy Pilates because swimming is a pretty solitary sport – so it’s nice to be able to talk to people.”
KEEP ARMS AND LEGS AS STRAIGHT AS POSSIBLE DURING THIS EXERCISE.