This week, as you run for longer time periods and walk for shorter intervals, try to maintain a steady pace and stay aware of your posture: Chest up, shoulders back, belly tight. We'll do upper body and core moves to build strength in those areas. Another new addition: Foam-rolling. It's an effective way to keep your muscles loose, less prone to injury, and reduce post-workout soreness. We've got to keep you healthy--race day is approaching quickly!