A great way to learn the 'head of the hammer', and the feel for PP#3. You can do this with a broom too. Maintaining the right wedge - the bent right wrist, is certainly a key step on the way to great compression.
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Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2