What the Country's Top Trainers Say Are Their Fitness Must Haves

Whenever I head to a workout, there's a fingers-crossed moment as I unpack my gym bag. On a perfect day, everything I need is there — from my socks to a water bottle to that extra hair tie that I always seem to need. But more often than I like to admit, I'm missing something, and it's not always an obvious omission.

To help solve this ever-present issuse, we turned to the obvious experts: trainers. Given that many of these women are teaching back-to-back classes while also running to and from meetings without much of a break in between, they live and die by their gym bag. From snacks to gear, see what top trainers always have in their gym bag.