 Now they’ve become an almost irreplaceable part of a fighter’s routine.The person holding the focus mitts will typically call out combinations and "feed" the puncher good counter-force while maneuvering and working specific skills.Focus mitts are often used as an augment to sparring, with more explicit focus on the puncher than the feeder, especially to develop good punch combinations and defensive maneuvers such as "slipping," "bobbing" and "weaving."