In an ambitious effort to expand its fitness platform, Let’s Do This has raised $60 million. TechCrunch reports the Series B round was spearheaded by venture capital firms Craft Ventures and Headline. Other investors included Morpheus Ventures EQT, NFX and Y Combinator, who were joined by angel investors such as the founder of Gmail Paul Buchheit and founder of Songkick Ian Hogarth. High-profiled names who also participated in the round include Serena Williams, Usain Bolt, and U.K. gold-medal runner Paula Radcliffe.