Complete a half marathon, you have 3 months to prepare
Complete a half marathon in less than 90 days from the Challenge start date
More energy, stamina and resistence
Running is good for your health, if helps you to keep your body fit and in a good shape, and of course, it will help you burning all that extra fat that it so difficult to get rid off.
Find a good program and start running slowly, increase the time and distance step by step, and never ever force yourself too much, take proper rest and remember that the challenge is just to complete the half marathon, the time doesn't matter this time.