Breathing Technique While Riding

Back when I was into cycling alot, I was told to belly breath not chest. Thats why the pro road bikers look like they have big bellys.(thats not why mine looks big lol)
So I noticed yesterday during running Zone 4 LTHR (170bpm) I was breathing in--4 strides, out--2 strides.

And if ya keep sipping from your camelback that helps the drymouth thing too--and it's more efficient hydration too(less energy to process, and better absorbtion into tissues)