I tried this 15-minute dumbbell workout — and could barely lift my arms the next day

A 15-minute dumbbell workout that targets your arm muscles. Here

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15 Min Arm Dumbbell Workout // Sculpt your upper body with Fun Music // No Repeats or Talking

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Two dumbbells, 15 minutes and these three exercises for seriously strong arms

Is a 30 minute workout enough time to stimulate maximal gains in strength? - Quora