The 7 Best 5-Minute, Bodyweight Arm Workouts on YouTube
You Need 5 Minutes and Zero Equipment to Crush These Effective YouTube Arm Workouts
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Shave an extra minute off your workout with this four-minute arm shaker. ModelFit trainer Sarah Rector leads this routine, which is set to upbeat music that'll keep you going even through the tough, pulsing moves — you don't put your arms down the whole time!