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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.
Like we learned with the Valsalva, briefly holding your breath helps stabilize your body, which comes in handy during explosive moves. Imagine that you are doing a jump to box, says Montenegro. Hold your breath when you make contact with the floor so that your body is more rigid, which will help with the rebound..