Exactly. I am tall with long arms, so my SPL green zone is lower.
Another good set for working to increase stroke length is:
Tune-up with 10 x 25m, or even 20 x 25m, working on achieving the lowest SPL you can hit. Pay no attention to pace or clock, but count every stroke.
Next, swim 4 x 25m holding your target SPL. If you add a stroke, start the 4 x 25m over and try again.
If you complete 4 x 25m, then go to 3 x 50m holding the same SPL. Again, start over if you miss by even one stroke.
Next, swim 2 x 75m at the same SPL.
Finish with 1 x 100m at the same SPL.
It may take you a while--several sessions or more--to be able to hold the same SPL through the entire 500m set. But it will be 500m of you swimming the most perfect stroke you can manage. Well worth it. I used to start every single practice this way.
I've been practicing TI for about 12 years now self-coached, and spent a long time focused on swimming at low SPL as my main priority. That has served me well, but along the way I've also learned that low SPL for its own sake is not really all that meaningful. I do most of my "real" swimming right in my green zone, at 15-16 SPL. Lower SPLs are valuable for training and maintaining balance and streamline--that's how I mainly use them these days.
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