Here is simple rule: the more you move anBefit Keto Cut d use the core area as part of creating your breathing action, the less stress can exist in the shoulders and the rest of the body muscles. It's a very mechanical cause and effect and the mind directs it. Pre-workout breathing and core action training is about 20 minutes, give or take, to bring the oxygen level up and get core muscles ready for the workout at the gym. The older you are the longer pre-workout of the core breathing action helps bring about the fat burning ability of th e body.