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Holding your breath is bad. The main reason is your body needs oxygen to workout properly. As you hold your breath you build up your CO2 in your body which will cause you to fatigue faster. Some of my clients either like to count their reps which helps them breath or during your contraction of the muscle breath out and when you relax breath in. So breathing will help you last longer in your workouts.
The CerebroSpinal Fluid (CSF) breath is to take hold and temper your energy. The CSF breath is to ground yourself and bring it back down to the spine through the fluid to ground your energy instead of being in the top crown all the time, which will exhaust and drain you.