Just saw this a minute ago. How beneficial do you think this is? If you say anything less than a crucial part in your everyday workout you're wrong. You're wecome for he new workout I'm sure youll all be doing this after watching the video.
https://www.youtube.com/watch?v=9ZJGzTHSe8Y&feature=youtu.be
https://www.youtube.com/watch?v=9ZJGzTHSe8Y&feature=youtu.be