Hi everyone! I have 2 clients that yawn excessively during exercise. What causes this?

I find it to be the bodies cry for oxygen. If you have a pulse oximeter, hook it up to them next time they start with the yawns. I frequently notice a drop in SpO2 when this happens. Nothing to be concerned with in most cases; just be aware when its going on. They may just need a different recovery strategy.

Could she be tired? Many people don't like to miss their workouts and train even though they are sleep deprived.

What time of day is your boot camp. Is it 5:30AM? Is it late in the day? Many people yawn as a consequence of fatigue.

I get that sometimes too. I wonder what it truly is.

I think it could be lack of oxygen or possibly they are a bit dehydrated?

I would assist them with showing them how to take deep breaths and ask them to practice this throughout their day

Lack of oxygen to the brain is what I've been told, but yawning is still a grey area in the sciences.