The hand has 27 bones, 39 muscles and 25 degrees of movement,
making it "the most complex musculoskeletal part of the human
body," according to Dr. Mircea Fagarasanu, Ph.D. Hand strength
is a necessary requirement for normal human function at any age
and at any level. Because of the hand's complex anatomy and
multifaceted use, hand strengthening can target a variety of
focuses, such as endurance, function, cooperative movements and
power.  Endurance is a valuable focus for labor workers who are
prone to hand fatigue. The most effective strengthening exercise
is a sustained contraction because you can measure frequency,
duration and intensity. You will need a Jamar dynamometer or a
mechanical analog bathroom scale. The advantage of the Jamar
dynamometer is that one hand can be measured at a time. Hold
onto the dynamometer with one hand or the bathroom scale with
both hands. Squeeze as hard as you can, for as long as you can
and maintain consistent pressure throughout the exercise. Record
the duration of the te