As Detective Olivia Benson on Law & Order: SVU actress Mariska Hargitay gets her fair share of on-the-job exercise. The Shape Magazine cover girl credits early childhood gymnastics and swimming for giving her an athletic build and life-long love of exercise. These days, cardio and strength training twice a week keep the star in shape along with a balanced diet and drinking plenty of water, according to an interview. Just because the winter has arrived, don't count out activities like swimming to keep fit. Find a local gym or YMCA with an indoor pool and set weekly goals for yourself, like Hargitay, of a certain number of laps finished to stay long and lean throughout the winter months.