My swimming sucks and my ankle flexibity sucks. My running is excellent. Will my running suffer if I work on ankle flexibility and really learn to kick?
I’m hoping to have my cake and eat it too.
Not in the slightest. In fact, I would bet that it gets better. Not because you are more or less flexible but because you are more aware of your bodies natural ability to…
On second thought, I’ll stick to the answer of “No, it won’t slow your running”.
Your body is the most remarkable training tool you will ever have. Never underestimate its ability to perform.
If you aim to stretch mainly at the limiting point of swimming ankle flexibility - the plantar flexion, it needn’t de-stablise your ankle at other points. If you continue to do stability work, you will find no difference in running-specific ankle stability.