Abdominal Muscle Stimulator Trainer Plus. EMS Abs Fitness Training Muscles Electrostimulator Toner.
 
Built-in Li-ion Battery and USB cable included, getting rid of endless battery replacements. The exercise intensity of the machine increases by 50% more than that of battery-powered products.
For best results, 20 mins a session, 1-2 times a day for 6+ weeks.  Use for quicker recovery after workouts. This muscle toner can help to tone, tighten and strengthen your body muscles on abdomen, arms and legs, etc.
 
The theory behind EMS is simple: when electricity stimulates your muscles for you, you can recruit more muscle throughout your entire body for every rep.
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Electrical Muscle Stimulation (EMS), also known as neuromuscular electrical stimulation (NMES) or electromyostimulation, is a protocol that elicits a muscle contraction using electrical impulses that directly stimulate your motor neurons. An EMS unit is a device that delivers this in the comfort of your own home.
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This stimulation creates muscle contractions that can be quick and frequent, fast with long pauses, or contractions that are held for several seconds or minutes at a time.
An EMS device allows you to engage in deep, intense, and complete muscular contractions without actually activating (or stressing) your CNS—not to mention your joints and tendons.