There’s no formula that will keep you from hurting your shoulders. Good technique is what helps with that but you’re swimming, so there is no cure all for shoulder problems.
First, if you have existing shoulder problems, see a doc who is familiar with swimmers and their shoulders and can help you with the proper PT.
For building up, swimming is not at all like running or cycling where you can just suffer it out and get in the miles. You can, but you don’t want to. Now’s the time to DECREASE the distance and speed, and work on FORM.
The way I feel about it, you never want to take a bad stroke. Never swim longer than your stroke can handle before falling apart. Push the limit, hang onto it like a MoFo but know when to get out. Right now I’m only swimming about 1500 a workout and going to 2000 this week.
The way I like to build is to drop the meters to where it almost doesn’t feel like a workout. (I’m starting @ 1000 this year because I haven’t swam in a few years) Do a ton of drills but most of all do steady-effort sets where I never let my stroke slip, even in the slightest. Count strokes, focus, and get it right. Each week, if I was able to complete all the workouts without problems, I add a few meters (200-500). By the time your get back to regular volume you’ll be swimming WAY better and will be going faster with less effort.
Once I get to full volume, I’m still going fairly easy with just a few efforts of race pace in there. Then I start to add the harder sets and swimming. First they are shorter, maybe 3-5x200. They grow in length from there. The key is to get a better stroke and be able to HOLD it for the hardest set of the season (something like 20x200).
The first component of Bill Sweetenham and John Atkinson program is: maintain correct stroke technique throughout the training session”
#5 Concentrate at all times while doing stroke drills
#6 Execute perfection in all stroke drills, concentrating on taking fewer strokes, but gaining maximum propulsion on all pulls
#21 To get an efficiency rating, add the # of strokes it takes to do a certain repeat to the time required for that repeat. For example 30seconds for 50M done in 30 strokes produces a rating of 60. The lower the rating, the better the repeat.
#22 Concentrate on hand speed at the back end of each stroke without slipping.
#28 Count strokes down and back in pools to check maintenance of stroke efficiency.
Yep, he likes you to hold a good stroke and KEEP IT!
In the beginning, you’ll not be doing much but by the time it really matters (race day) you’ll be a far BETTER swimmer and be able to produce faster times.
Hope that helps!