by Greenfields The X-TREME NINJA line by Greenfields Outdoor Fitness is ready to test your strength, agility, and endurance. Race through the obstacles, improve your time, and compete with friends! Not for the faint of heart, the X-TREME NINJA course offers challenging features such as peg walls, rotating rings, swinging ropes, and much more! GREENFIELDSFITNESS.COM 888.315.9037http://www.GREENFIELDSFITNESS.COM