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“My forearms are under attack, my triceps, biceps, my delts,” Foster said.

Rare is the queen who spends five days a week at the gym inflating masculine pecs, amplifying delts and defining abs — or, worse, ignoring altogether questions of style, anatomical or applied.

Candidate Rock is a little like Michael Bloomberg, but with more convincing platitudes and even better delts.

Instead of having to remember which muscles are your quads or your delts, or figure out how to target your triceps, you simply need to make a quick assessment.

In the preppy tradition, they layer well; in the macho one, they highlight virtuous delts.