Walking is a terrific form of exercise, but it shouldn’t be the only type of exercise you do. It’s important to do both aerobic workouts and strength-training workouts, along with flexibility exercises, whether in your daily life or when training for a race. And ideally, you should vary the type of aerobic exercise you do, such as walking, biking and more.
I received group fitness instruction certification from the American Council on Exercise (ACE). The ACE website is a terrific resource — visit it at www.acefitness.org.