@Quadgirl & @needlesandmath,
There are a lot of general recommendations for this stuff. And those things can be used by anyone.
But to get things really dialed in, the regimen is going to be 100% unique for the individual.
I want to share some thread examples from an FUD superstar, @daisymae. 
She used to start her swims at 200. Now she can start at 100 and end at 90.
(And now, if she goes above 120, she gets pissed. 
)
Her first thread is over 2,000 posts! The second thread is now over 200.
If you really want to get information that is specific for your scenario, that’s the way to do it. Start your own thread that is specific to you. That way when someone replies, they know if you are on a pump, on Tresiba, what you are doing, etc, etc, etc.
Posting these as examples of what it looks like from start to finish. All the incremental steps, and as a success story to share what @daisymae has done.
https://forum.fudiabetes.org/t/daisy-maes-swimming-bg-thread
https://forum.fudiabetes.org/t/getting-back-into-the-pool-after-2-years-away