From the article:

" >These positions—which, in addition to a deep passive squat with the feet flat on the floor, include sitting cross legged and kneeling on one’s knees and heels—are not just good for us, but “deeply embedded into the way our bodies are built.<”

But several of my friends suffered heart attacks (embolism) after long periods of kneeling to worship and/or to garden.

I conjecture that, contrary to the article, kneeling on one's knees is not only not "good for us" but bad, as it may inhibit blood flow in the legs, promoting the formation of clots which are later released upon standing and moving around.