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Don't Fear Muscles

No, you won't bulk up, but you can have strong, extremely toned legs like Jessica. Take her trainer Harley's advice: focus on your legs twice a week by doing different types of lunges as well as squats. In her gym, we also spy kettlebells, which are another great way to build muscle and burn tons of calories — on average, 400 calories in 20 minutes!

Read More Best Of 2014 LivingWeight WatchersBest Of 2014Celebrity FitnessHarley PasternakJessica Simpson