I agree with a lot of what Unident said.
When it comes to transitioning to running, you could keep your running speed down. Not that much faster than a brisk walk. Fast enough that you can keep a steady rhythm, but not too fast to be taxing. What speed is comfortable is going to differ from person to person and you may need to experiment to find what feels right to you, but as a rough guide, somewhere in the range of 4.5-5.5 mph.
Once you are running continuously comfortably, then you can start working on your speed.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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