You keep your arms still at your sides while walking, or swing them without bending them. You notice that your hands swell quite a bit while walking.
A normal walking motion uses the arms to counterbalance the leg motion. A walker can add power and speed by using the arms effectively. Long, straight arms act like a long pendulum, slowing you down.
The cure: Bend your arms 90 degrees and swing them naturally back and forth opposite the leg motion.
Walking Arm Motion
