Catching your breath-Why do people (me) bend over at the waist when trying to catch their breath?

Why do people (me) bend over at the waist when trying to catch their breath. I do this and put my hands on my knees as I stop to catch my breath. It just seems natural to do and it helps.

I have been taught to purse lip breathe but this is not as effective as bending over at the waist and really taking the biggest breaths I can

I just always wondered about this.

Thanks JWG