This is a bit of a tangent but have there been studies about deep breathing combined with physical movement, relative to just deep breathing? I've done yoga on

This is a bit of a tangent but have there been studies about deep breathing combined with physical movement, relative to just deep breathing? I've done yoga on and off for a number of years and the synchronization of breath and moderately difficult physical exercise to me, seems like the sweet spot that breathing alone would fail to accomplish.