This document is a project report on digital marketing in the sportswear industry. It includes an introduction to the industry, describing trends like the growth of fitness clubs and the blurring lines between sportswear and casual wear. It then analyzes the macro environment factors like legislation and the economy that influence the industry. The next sections provide micro environmental analyses of major brands Nike, Adidas, and Under Armour, describing their collaborations, suppliers, customers and digital marketing strategies. The report aims to understand how these brands use social media to increase revenues.