The power of a concentrated attention

In sporting activities those who want to be successful choose a certain line or subject which appeals more to them and suits their nature; they concentrate on their choice and take great care not to disperse their energies in different directions. As in life a man chooses his career and concentrates all his attention upon it, so the sportsman chooses a special activity and concentrates all his efforts to achieve as much perfection as he can in this line. This perfection comes usually by a building up of spontaneous reflex which is the result of constant repetition of the same movements. But this spontaneous reflex can be, with advantage, replaced by the faculty of concentrated attention. This faculty of concentration belongs not only to the intellectual but to all activities and is obtained by the conscious control of the energies.

Ref: On Education