Are you making a change to your stroke? Struggling? Does it seem to require continual focus?
Here’s an interesting rule of thumb: After focusing on a change for six swim sessions it should suddenly feel a lot more natural. That’s just how it works, you’ll get in on your 7th session and it’ll just click - the modification suddenly feels smooth. So, if you’re struggling with a stroke change, a drill or a timing change, hang in there for those 6 sessions!
Perhaps even more important is the flip side to this: If a change doesn't click after 6-8 sessions then you need to try another approach, what you’re doing isn’t working.
For more background theory on how humans develop skills, see our article: www.swimsmooth.com/learn