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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.
So if you are overweight you will have short breath, your body has a hard time achieving oxygen so you get tired more quickly and cannot do things that are physically demanding for long periods of time. If you feel that you have short breath, it is probably because you are overweight.