From the starting position of push-ups.
Retract the shoulder blades, so that the back is rounded.
In addition, engage the back muscles so that the shoulder blades are also depressed.
Finally, contract the abs and perform a hip retroversion, so that you lose the lumbar curve.
From this position, perform a push-up trying not to lose form.
When you finish the push-up and lock your arms again, adjust the position again.