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For more than 20 years, The Leukemia & Lymphoma Society's Team In Training (TNT) program has been unparalleled in training people from first timers to seasoned athletes to achieve their best at marathons and half marathons. TNT is the world's first, best and largest charity sports training program. No matter your sport, TNT offers: great coaches, great people, lots of options, a fabulous weekend, fundraising support and a lifesaving cause.