Some weeks are busier than others, but let's face it-when are you not on the go and feeling frazzled? "So many women give up their workouts because they assume it's a waste if they can't do an entire routine," says top Los Angeles trainer Kristin Anderson, who designed these plans. "But that's how the pounds start creeping on."

Nix the pounds, not your routine, with these three, five-minute circuits that target several muscles at once. Do them any day you're on the go-when time isn't on your side.

The Plan

How it works

Do each move in every circuit in order for 1 minute. Complete as many of the circuits as you can-or break them up throughout the day: one in the morning, one at lunch, and one at night (do what works for your life). On those rare days when you're not as time-crunched, do all three circuits twice with a two-minute break after 15 minutes.

You'll need

A set of 5- to 8-pound dumbbells and a foam roller.