Good swim instructors will point out form errors. They'll also mix things up a lot. Warmups (both in and out of the water), form drills, speed drills, safety drills... Honestly, I find swim drills fun. This probably makes me a sick puppy, but *shrugs*.
If you poke around some, many Red Cross Swimming (ie, top level) instructors are quite good. I used to sit in on one session of the top level class at my pool every summer even after I passed my test, just for the practice. Helped cut down on my tendency to swim in circles (and a whole host of other bad habits). Free lesson time was one of the perks for volunteering to help teach swimming. Lifeguard classes can also be good if you need structure, tho the drills there will be slanted differently. A lifeguard cert never hurt anyone tho.
IME, the instructors for private lessons are not as good. They just don't push you as hard as a regular class will.




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