Step the right foot back alongside the left, maintaining hip width between them (the hands are still shoulder width apart).
Again, try to maintain a single line along the heels, hips & head. Trying not to raise the hips or to allow them to 'sag' down.
Extend the spine into the base of the skull.
Relax the shoulders & allow the shoulder blades to settle down the back.
You could at this stage perform a slow press up to build strength in the arm, chest & shoulders. Breath in as you lower down & breath out as you raise. Remember to remain relaxed.