No more crunches! This trainer’s dumbbell workout takes under 20 minutes and builds stronger arms and abs at the same time

Kill two birds with one stone (dumbbell) in as little as 15 minutes using this trainer's abs and arms strength building workout.
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This trainer's 20-minute workout strengthens your core, improves endurance, and fires up your abs

People bang on about core strength because it’s the powerhouse of your body. It keeps you steady when you move, helps you lift better, run stronger, and even sit without your back nagging at you. With ...