Good lord I feel amazing. Yesterday I bought these:
which are my first ever pair of running shoes and which were appropriately expensive. I've decided to name them Brett and Sally. Today I put them on (with a pair of neon blue leggings) and spent the duration of Sainthood, by Tegan and Sara - who else? - running, jumping around, punching the air, and doing more boy-push-ups than I ever have at one go.