Sparthos High-Altitude Workout Mask

Push past your limits with this mask! It is in great condition, offers welcome. From Amazon (original seller): Have you ever noticed how calm and relaxed the best endurance athletes look when they’re pacing themselves through a race? The ease with which they run 5:00 min/mile or cycle above 30 mph? Obviously they put in a ton of training time, which you probably can’t replicate, but they also use the latest sports technology to amp up their stamina… so why aren’t you? Altitude masks are the easiest way to improve fast. All types of athletes, professional and recreational, can use them to take their training up a notch. From gym enthusiasts to runners, cyclists, and martial artists. Therefore, if you want to experience substantial aerobic gains - and an edge over the competition - then you can start by investing in this breathing resistance device.