The GoZone power band is a versatile accessory for improving flexibility and strength. If you want to build muscle, and don’t have room for a large free weight collection, power bands like this are the perfect solution. With a variety of exercises, you can challenge every muscle group with a resistance band. These bands are recommended for beginners, as well as more advanced athletes who want to change up their strength training regimen.Light Power Band – 40-50lbs of resistanceMedium Power Band – 50-60lbs of resistanceHeavy Power Band – 60-70lbs of resistance