The single-digit body fat six-pack circuit

The biggest mistake of getting a summer six-pack? “Not starting soon enough,” says David Kingsbury, the PT who got Hugh Jackman in shape. Yes, if you want abs come beach-season then you’ve got to start working on them now. In other words, you need to start his workout today.

This circuit is all about stripping your belly blubber, while building up the abs underneath. Replace one of your weekly workouts with this circuit and you’ll sculpt a solid core in six weeks.