The Swimming Guy

Lately I have been trying to swim faster. It all began when I overheard some guys at the pool talking about YouTube swimming tutorials. When people mention watching YouTube tutorials I generally put my hands over my ears and shout “no no no no no,” so I can’t say I went so far as to actually listen to them. But this notion of one swimming faster tomorrow than one swam today or yesterday or last week was most intriguing. It had always seemed to me that one’s swimming speed was decided at birth. Could it be I had gotten this wrong?