I wouldn’t go so far as to call my instructor a "nazi scuba instructor" that’s a bit harsh. I on the other hand have always been in peak physical condition and a little "cocky". I believe I asked him if he wanted me to do it in all strokes. Back in the 70’s I was a state rated swimmer in high school. I’m 61 and probably could do it now, albeit a little slower. I could have done a 100 of each in 73. Unprovoked I’m sure he would have asked for the standard qualifying swim. I still train now, old habits die hard, and swim 3 to 5 days a week and in the gym 3. Never hurts to be in shape when it comes to getting older ;)
I just did a 100yrd swim in 3ft seas against a moderate current on the Superior Producer shore dive to get back to entry point in Curacao. Any of you found yourself in that situation on that dive will understand. I was sure glad I still had it in me and my swimming ability at my age sure paid off.