You don’t even need to set foot in a gym to do it. For most of us, traveling and time constraints don’t end with a holiday season. Work and family commitments are a year-round obstacle to getting in great workouts. That’s where this suspension trainer ab workout comes in. It’s fast, effective, and portable. Just hook it up to a door or tree, and you’ve got a full core session wherever you are. Take it on the road with you and you’ll have no excuse for not boasting lean, hard abs any time of year.