I had a conversation with an athlete recently regarding removing the variables in training. Swimming is probably the easiest. Very few things change. My local pool does not change in length (to the best of my knowledge), the viscosity of the water does not change very often, the temperature of the water is consistent and I wear the same swimming attire. Therefore, the only thing that changes is me (my stroke, my intensity, my motivation). Swimming 100’s on the 45 should be the same day in and day out. If I improve on my times then I am working harder or I am more efficient. Easy stuff.
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