Looking for another good reason to purchase a Lifetime sit-on-top kayak? How about the health benefits? Kayaking can be done leisurely or aggressively depending on your goals - and you see your progress literally as you move across the water. Leave the rowing machines at the gym on hop onto a lifetime kayak for a great outdoor cardio workout and relaxation together. Kayaking is a great way to help tone your upper body including your shoulders, back, and arms.