Getting in shape is always a popular New Year's resolution, which for some means joining a gym. Since Thanksgiving marked the beginning of the eat-your-heart-out season, January is all about new beginnings. Maybe your fitness routine never slowed down, or this month you've decided to put your oft-neglected gym membership to use. We're curious if any of you are embracing a new commitment to fitness by joining a gym this year. If this sounds like you, make sure to check out our tips for picking the right gym before you do, then hit the ground running with one of these seven treadmill workouts.