On Days vs. Off Days

When swimimg I'd assume most people have "off days" and "on days". During the on days you may feel smooth, relaxed, strong, and that your stroke is technically sound. The off days you may feel sluggish, tight, tired, weak, slow, and your stroke feels sloppy. My question is, can someone standing on deck see the differences in your stroke from one day to the next or is it all in the swimmers head?
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