This might be obvious but......

I observed something interesting at the salle the other night. I was indulging in a foil match and was determined to do better in this one (foil is my first weapon after all) so was really giving it some attention. It became apparent to me that I had a bad case of epee arm going on, which was quite a realisation in how I could potentially hop between weapons. In epee the arm is held quite a lot stiffer, due to it being a heavier blade and hits being made with a lot of resistance. The fact that there is no concept of parrying in epee tends to mean attacks are opposed rather than parried, mostly with a stop thrust in an attempt to get a double. In foil the arm must be trained to use the lighter foil to parry and riposte and also perform feints and compounds, which are rarer at epee.       
So I had developed a real case of epee arm, muscles stiff and arm virtually fully extended but once I relaxed my shoulders and arm a bit I found I was able to reconnect with some of my old techniques quite effectively. It is amazing how quickly the mind and muscles pick up new habits but it should be remembered that it can be counter-acted by observation and application. This is true of anything in life I guess, whether it be sports, dieting, bad posture etc, so I shall now be putting it into practice on the piste whenever I get the chance.