Should the standing long jump be an inside character or an outside character?

The distance between your feet is shoulder width and your feet are parallel. This stance can not only strengthen the forefoot.

Powerful landing action, and can extend the pedal to all toes. If you stand with your feet in the posture of "outside picture" or "inside picture", the local area inside the sole or outside the forefoot will be stressed, and sufficient ground reaction force cannot be obtained.