Located in Sun City South Africa, the 918 foot high ProNutro Zip 2000 will get your heart racing as it travels 1.2 miles at 100mph. Great video!
National Geographic asked Olympians for workout advice for weekend warriors who want to improve their endurance, power and speed. Here is the breakdown.For endurance, Rebecca Dussault, cross-country skier, gives us this workout. Jog slowly for 15...