A while ago in bloggerland, boynton tried to track down something on the relationship between exercise and writing, and more specifically bike riding. This was probably the link she sought.
You won't find advice about taking a brisk walk or a vigorous swim in any writing handbook I know about, but I'm convinced those are good ways to create the conditions for more effective writing. Try it!
Shame it's windy out there othewise she'd be jumping straight on the bike for a quick spin out to Doncaster - or even Warburton. (Warburton must be good for a few scenarios)