Face: Apply a sweatproof sunscreen (with an SPF of at least 15), 30 minutes before you go out.
Shoulders: Roll your shoulders back and down so you're standing tall with your ears aligned over your shoulders, hips, knees and ankles. This posture will help you take stronger strides.
Elbows: Bend your elbows to 90 degrees and pump your arms, keeping them close to your sides.
Ankles: You can buy ankle-supporting shoes designed specifically for walking, but many running sneakers are fine, too, according to the American Podiatric Medical Association.
Feet: Wear thick, absorbent socks; avoid 100 percent cotton, which can make feet damp.