I believe you'll develop speed via strength work which includes hill running either repeats or running hilly courses as the Kenyans do on a steady basis.
Sweater n.: garment worn by child when its mother is feeling chilly.
I grew up in a very old-fashioned Roman Catholic Italian-Irish family in Philly.
Words to me were magic. You could say a word and it could conjure up all kinds of images or feelings or a chilly sensation or whatever. It was amazing to me that words had this power.
From year to year environmental changes are incremental and often barely register in our lives but from evolutionary or geological perspectives what is happening is explosive change.