Four by Four Posted on May 20, 2016 by Mark Adam Just starting a 4×4 run. It’s 4 minutes of walking then 4 minutes of running, repeated 4 times. I guess you could call it a 4x4x4. Share this:TweetMoreEmailPrintTelegramWhatsAppRedditShare on TumblrPocketLike Loading... Related Author: Mark Adam Actor, musician, comedian, tech geek, and entertainer. View All Posts