When it comes to eating right, Kaiser -- who works with notoriously fit celebs like Shakira, Sarah Jessica Parker and Kelly Ripa -- emphasizes the importance of eating whole foods and drinking lots of water to promote long, lean muscles. "Stick to unprocessed foods without sugar and additives and preservatives," she says. "Whole grains, veggies and lean proteins are all going to help you."

Kaiser also recommends you cut yourself off from eating three hours before bed, and "stay away from sugar," she stresses. "It's more toxic than alcohol and four times more addictive than cocaine. Be wary of foods like skim milk, processed yogurt, workout recovery drinks and any type of bar," she says. These are some of the things we don't realize are high in sugar.