But believe it or not, there are common mistakes that can decrease it's effectiveness and lead to tension, low back pain and fatigue.
Good posture is critical.
Make sure your ears, shoulders, hips, knees and ankles are all aligned. Your chin should be parallel to the ground, eyes focused 15 to 20 feet ahead. Overweight exercisers in particular tend to make their stance too wide, which causes the upper body to work against the natural stride and slows you down. Check your position by walking with your back to the sun, so that your shadow falls in front. If your shadow sways from side to side, narrow the width of your stance.