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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.
Key Facts In This Video. 1  Science says, without training, you can only hold your breath for about one minute. 00:04. 2  Our lungs can hold about four minutes worth of air. 00:23. 3  To hold your breath longer, it helps to be relaxed, motivated, and to be distracted. 01:17.