If you need a motivation boost or are looking for new routines, try a workout DVD ($10 to $30 each). “You get to exercise with a top trainer for 30 to 60 minutes right in your home,” says Marrone. You can also expand your repertoire of moves (and hit more muscles) if you check out a new DVD every week or two. Marrone’s favorites include Physique 57 and The Biggest Loser Workout for cardio and interval-training exercises, as well as offerings from trainers Tracy Anderson and Gunnar Peterson. Browse online or in bookstores, or hit up your local library.