We know, we know, not another 100-year roundup video. But this one is actually worth watching. Cassey Ho of Blogilates fame kills it, highlighting fitness trends from each decade—and the outfits worn while working out. Our favorites tend to be the wackier ones, like leather barbells (yep, those were a thing), strength trainers that resemble torture devices, and, of course, the Shake Weight.
(h/t Marie Claire)