Isometrically refers to a type of exercise or movement that involves contracting the muscles without any accompanying movement of the joints. Synonyms for isometrically include statically, immovably, rigidly, firmly, motionlessly, and stationary. Other synonyms might include fixedly, unchangingly, steadfastly, and unyieldingly. These words all describe an action or state of being that is stable, unchanging, and without any movement. Isometric exercise is often used in physical therapy to help patients recover from injuries or surgeries, as it can help to build strength in the muscles without the risk of further injury. Whatever synonym you choose, the basic idea remains the same: isometric exercise involves static contraction of the muscles.