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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.