Doing isometric Without moving the surrounding joints, Trusted Source exerts pressure on specific muscles. Isometric exercises can help to improve physical endurance and posture by strengthening and stabilizing the muscles through constant tension.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.