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Dear Conrad,

Isometric exercises are so easily carried with you that there is little need to do them at a gym.  The best exercises to do at the gym are isotonic and moving exercises of all kinds.  Isometric ones pit stationary joints and muscles against an immovable object, for example, pushing one fist against the other palm; trying to stand up while being held down, and similar workouts.  The most useful time for isometrics that I have found is when parked at a stoplight or while spending hours on a long flight.  The do indeed produce stronger muscles.  I hope this answer is satisfactory.

George L. Dixon, Jr. M.D.