Feel the 16 mm. difference. Theragun percussive therapy is a revolutionary deep muscle treatment that uses rapid, repetitive strokes to stimulate blood flow and heat. Theragun's unique 16 mm stroke length and industry-leading speed delivers the most effective muscle treatment of any handheld device. Forty (40) lbs. of force instantly relieves soreness and muscle tightness and breaks up knots, without stalling. A lighter speed kneads extra-senstive, sore areas. Use the G3 to treat sore muscles post-workout to accelerate muscle repair and recovery. No foam roller needed; instead use the G3's ergonomic multigrip for targeted myofascial release on hard to reach areas. Optimize your warmup the next day by improving muscle coordination and range of motion in just 30 seconds. The G3 activates tired muscles to help you feel re-energized, every day. The G3 is Theragun's quietest model yet and makes no sacrifice in design.