isometric exercise /(?)/

i·so·met·ric ex·er·cise

isometric exercise

n.
  1. A system of exercise to strengthen specific muscles of the body by pushing parts of the body (such as the two hands) strongly against each other, or against a fixed object, so that the muscles are strongly stressed, but are stretched only a little. It is claimed to produce strength in the muscles thus exercised. Also called isometrics.