Under Armour has signed a multi-year partnership deal with New York-based Authentic Brands Group, the firm that manages the Ali brand, to incorporate Muhammad Ali into its ad campaigns and products. The financial terms of the deal were not disclosed. The boxing legend, who turned 73 in January, is affected by Parkinson's disease, which limits his capacity to physically promote the deal. The marketing campaigns will feature classic video clips and quotes from the former athlete. After launching a limited edition T-shirt, which went up for sale on the company website on Feb. 18, Under Armour said it plans to introduce a full line of Muhammad Ali clothing, shoes and accessories this autumn.