I did search twitter and found 3-5 year olds! https://twitter.com/search?f=images&vertical=default&q=push%20up%20plank%20meeting&src=typd https://twitter.com/s

I did search twitter and found 3-5 year olds! https://twitter.com/search?f=images&vertical=default&q=push%20up%20plank%20meeting&src=typd https://twitter.com/search?f=images&vertical=default&q=push%... Actually I found a more recent tweet depicting the actual practice, which has since been deleted. For the record, it was the same photo that appears in https://medium.com/@william.liu/daily-plank-meeting-732456e6f7b1 https://medium.com/@william.liu/daily-plank-meeting-732456e6... , a post that advises (!) this practice.