I swim a lot on my own in open water but occasionally I get to swim with different groups.
I am always one of the slowest swimmers and have to swim flat stick not to be left behind and these are generally not elite swimmers.
I recently had some one on one TI coaching and there was a couple of things to tweak and having attended to those I feel really great in the water but in terms of speed it doesn't seem to do anything.
Swimming by myself it isn't an issue only when I join a group.
The question that I have, is this a general thing among TI swimmers?