Crazy exer-ball trick

Popular Science breaks down the science of it here, but after the first couple paragraphs it just started to look like blah blah blah blah blahblahblahblah

1 thought on “Crazy exer-ball trick

  1. Yeah, looks like one of those things where moms say, “What are you trying to do, break your neck?”

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.