Bending your arms, to work on your arms during fitness walking:
Start your fitness walking with your arms by your sides and, after a few minutes, bend your elbows to swing your arms, as explained in this article. Keep them close to the body.
Your arms should move in the same direction as that of travel. Under no circumstances should the hands reach above chin level. While walking let your elbows swing backwards; they should brush your hips at each movement.
Unlike in the previous exercise, walking with bent elbows will cause you to shorten your stride as you feel yourself moving faster. You should therefore seek to have your arms at an angle that best matches your speed and think about setting their rhythm according to your steps to achieve a regular stride. At the end of the session, do a few stretches.