Everyone laughed at my running posture.

Running posture is a habitual action formed in people's life. There is a certain relationship between posture and running speed, but there is no necessary relationship. I think the standard action is to keep the upper body upright or lean forward properly, swing the elbow naturally before and after bending, alternate legs, lift the thigh forward and land the forefoot. If you want to change your running posture, just like changing a habit, you need to change it bit by bit.