Now that spring is officially here, there's no better time to take your fitness routine to the next level — and outdoors! Whether you're training for your first 5k walking race or powering through a circuit training workout, our energizing playlist will have you saying "yay" to exercise. From Pharrell's "Happy" to Lady Gaga's "G.U.Y.," these feel-good songs will get your body in the mood to release those happy hormones. During your interval exercises, pick up the pace during the choruses and have a slow recovery during the verses. For your strength training exercises, take slow up and down reps during the choruses and take a short break between verses. Enjoy listening!