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Sitting isn't entirely bad if you choose to stay active while sitting. This workout allows you to do that.
It's a modest workout but it allows you to engage all muscles. You'll especially feel it in your hip flexors, which are weak for most people.
There's a good chances you spend at least 30 minutes a day watching TV. Why not doing this workout as you enjoy your favorite show.
Be warned though, sweat will be dripping all over your body.
Enjoy the sitting dumbbell workout for full body toning and fat loss.