If one can breathe and brace simultaneously during resistance training, the timing of breathing becomes less critical.

“when doing resistance training that bracing the body by essentially not doing a big belly breath but filling the body with air so that you essentially create a firmness within the abdominal walls and the spinal Erectors and the obliques so this would be essential in a squat type movement or other types of movements that's beneficial during resistance exercise to create the most stable canister of you the most stable activation of the musculature around the spine to avoid injury and also to lift the greatest amount of weight”