The video
shows just one of the
possible leveraging feats that can be done with a sledgehammer. This
one involves lowering the weight to the nose then pulling it back up.
Always a crowd pleaser, because it involves the danger element. If you
were to not have the strength, the hammer would come down hard.
Other levering feats include raising the hammer from the ground to an
upright position or just holding it out straight from the end.
All these moves involve the hand movements called ulnar and radial
deviation. That is bending the hand from side to side, an oft neglected
degree of movement and strengthening that is important for many feats
like bending steel.
Slim 'The Hammerman' Farman is by far the strongest in all these moves,
hence the nick-name. His records are likely never to be broken.