For good posture in the upper half of your torso...
The shoulders should naturally sit back, slightly behind the body...
With the chest up, as opposed to slouching forward.
Contrary to popular belief, this posture is held, not through conscious effort, as we are led to believe as kids...
When adults remind us to sit up straight…
But rather, by two conditions, that allow us to hold straight posture entirely unconsciously.
The first condition is adequate flexibility in the chest...
But you typically only see problems here, with bodybuilders who focus too much on chest, and not enough on back.
The second condition is adequate strength and activation in the upper back...
Particularly the rhomboids, which are responsible for retracting the scapula, and pulling the shoulders back.
Problems in this are WAY more common.
The good news once again is....
Sprint training alone, automatically corrects both of these potential problems over time, over time...
Simply by building all the muscles to the right size, in the right proportions...
With the necessary flexibility to allow the body to function as it was naturally designed to.
Up next...