Have you ever wished you could increase your hand strength?  Or maybe you’ve wished you could speed up the development of calluses on your fingertips for more comfortable playing.  Believe it or not, tools have been invented for these purposes.  One allows you to exercise your fingers against heavy springs, strengthening the hand enough to bring barre chords into your reach.  It has optional callus builder caps that are designed to toughen your fingertips, too. More Cool Tools for Guitar Players