Three points in the demonstration
The demonstration begins with standing and stepping. The instructor suggests practicing movement forward and backward, then letting the arms swing naturally without tensing the shoulders, with a slight forward lean while moving.
This describes one demonstration; it is not a universal rule for running form. Guidance may vary with pace, distance, experience, and injury history. If you feel pain or have a medical condition, stop and consult a qualified professional before continuing.
How to use the video
Start by observing the demonstrated movements and consider whether they feel comfortable. Do not force yourself to copy them if doing so causes pain. The short video does not cover warm-ups, increasing distance, or injury prevention.