Editors’ Notes Anyone can make a New Year’s resolution; the hard part is keeping it. Mixing dance pop with uptempo R&B and hip-hop, this set is designed to keep you motivated and inspired toward your fitness goals. Whether you’re throwing yourself into a new routine or just trying to get some momentum after holiday inertia, these tracks should help give you a little juice for January and beyond. Our editors update things here regularly, so if you hear something you like, add it to your library. And remember: It takes a little while to form a habit, so if you slip, shake if off and hop back on.