POPSUGAR Photography / Matthew Kelly It wasn't all that long ago that box jumps, burpees, and treadmill sprints likely dominated the fitness side of your social feed. Nowadays? I'll bet it skews more toward things like hot girl walks and Pilates . There's been an undeniable shift in the fitness culture lately, and it's seeming to steer away from brutal, bring-your-all type of workouts and...

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