Don't lean forward as you walk. Keep your body upright, but relaxed, and don't tilt your pelvis as you move forward.
Keep your head in line with your body, looking forward, so your breathing won't be impaired.
Keep your arms bent at a 90-degree angle and swing them as you walk.
Use your hips to create a forward momentum by moving them from front to back. This hip movement pushes the knee and foot forward.
Don't reach out too far with your stride. Your hips should be in the lead, not your feet. The faster you move your hips, the faster you'll go.
Plant each foot heel first, then roll your foot to the outside and spin off from the tips of your toes.
Breathe from deep in your belly, inhaling through your nose and exhaling through your mouth.