For a start,
Why do a broken 200 as opposed to a regular 200? What is the particular advantage of breaking up the distance (or any distance for that matter)?
Is it better to break it up at the 50 or the 100?
What is the ideal rest time between 50's and 100's within a broken 200?
What is the ideal rest time between broken 200's within a set?
What is the ideal number of 200's to do in a set?
Are the accumulated times of a broken 200 an accurate indicator of how fast you can actually go?
If breaking it up at the 50, how much time should be added on for each flip turn?
How many broken 200's should I be able to do at a specific time to be confident that I could repeat that time in a race?
My team regularly does sets of broken swims. For a 200, we may do a set like (something like 30 or 45 sec rest after each)--
1 x 200 cruise
2 x 100 w/15 sec rest at break
4 x 50 w/10 sec rest at break
8 x 25 w/5 sec rest at break
1 x 200 all-out
If done correctly (taking the proper rest), and if the coach calls out times, you can then compare your final times (subtract the rest) and see how they compare. You can also see how turns impact your performance, as you'll get fewer (or none) with the shorter distances.
My team regularly does sets of broken swims. For a 200, we may do a set like (something like 30 or 45 sec rest after each)--
1 x 200 cruise
2 x 100 w/15 sec rest at break
4 x 50 w/10 sec rest at break
8 x 25 w/5 sec rest at break
1 x 200 all-out
If done correctly (taking the proper rest), and if the coach calls out times, you can then compare your final times (subtract the rest) and see how they compare. You can also see how turns impact your performance, as you'll get fewer (or none) with the shorter distances.