Whoa, flashback! That picture is a screenshot from the first iteration of Eiriu Eolas, where an exercise to improve belly breathing was being demonstrated. SHOTH is a suitably heavy book to work your diaphram against! As Palinurus said, it was superseded by a newer version of the EE video available here.
I seem to remember an image of belly breathing being demonstrated in the garden, but can't remember in what context or where. That screenshot is also in the new version, so the missing image is still missing.