Very effective. After exercise, our muscles are still too nervous at rest because of the excessive excitement of sympathetic nerves. If we don't relax and stretch, our muscles will ache. Fascia gun is a device to realize deep relaxation of myofascia by vibration principle, which is suitable for physical massage after fitness and daily relaxation at ordinary times. I have been using m a dog MFG-0 1 for more than two months. Every time I finish running, I use it to massage my calf, which is very comfortable. My calf muscles relax quickly, and the speed of m a dog reaches 2500 times per minute.