What to wear: If you're a Peloton fan, chances are you know who Leanne Hainsby is. The cycling instructor is uber-popular, and with many of us hopping aboard the Peloton train, she's a good person to embody for Halloween (her or any Peloton instructor, that is). To become Leanne, wear your favourite Peloton top and leggings ... don't forget the matching scrunchie.