Intensify your own workout routine like Hathaway by adding weights to your usual squats. With arms at your sides, take a dumbbell in each hand. Stand with legs hip-width apart and toes pointed forward. Bend knees while curling dumbbells into your chest keeping your elbows close to your sides. Once you reach the squat position (try to have your legs at a 90-degree angle) press dumbbells up, stopping just before arms are straight. Then bring your arms back down, reverse the bicep curl and stand up. Repeat 20 to 30 times for a quick full-body workout.
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"Anne travels everywhere with it and took it with her on the movie set," Kirsch says.