Tense? Stretch! Stretch the muscle to release the knot - to
   relieve the tension. Tension is merely a shoe-lace. Pull the
   ends tight to release the tension - to undo the loops and to
   relax. [How one of the shapes of the Electron/Photon itself has
   practical benefits.... "Wave/Particle Duality of nature can be
   explained by a shoelace and can relieve all tension, stress, all
   misunderstandings and uncertainty in everything, everywhere"
   says Kenneth Udut of Naples Florida USA on 7/19/13:-) ]