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-732456e6... , a post that advises (!) this practice.
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-732456e6... , a post that advises (!) this practice.