Like standup paddleboarding, kayaking is a killer core workout: To stabilize yourself and the boat, and to generate movement and power, you need to engage your entire midsection. (Yep, if you’re using proper technique, your shoulder and arm muscles are secondary.) Paddle fast enough to increase your heart rate, or take a kayak-based fitness class, and you can burn plenty of calories, too. Launch from one of these dozen spots.