10 Plank Variations to Challenge Your Core August 4, 2019 Dr.BTZ Leave a comment Even though Einstein’s theory of relativity doesn’t relate to the plank, it feels like time slows down when you hold the position long enough.READ MORE:try these challenging and dynamic plank variationsStory BY HENRY HALSE DECEMBER 5, 2018 Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Related
