Summer is here, and as we start off July, some may be re-starting their fitness routine. It has been said in studies that just by listening to your favorite music, you can see an increase in your performance and endurance. A pretty simple tweak to help you get a jump start. Why not give your gym music arsenal a switch, and test out the Sennheiser MX 686G Sport Earphones. Why you may ask? Take a read to find out!