Basic rules

1.Running form

Your head should be straight and slightly leaning forward. Keep your shoulders low and loose, and chest upright. You can slightly swing your arms back and forth, but do not do side-to-side motions. Reach for your legs just ahead of your landing, and do not reach out too far to avoid exerting too much pressure on your knees. Land on your heels, and push off with the front part of the feet.