By Amy Tennery NEW YORK (Reuters) – For some, retirement is a time for relaxation. For 2017 New York City Marathon champion Shalane Flanagan, running six marathons in six weeks has proven a more appealing post-career project. The four-time Olympian, 40, started her mission with the Berlin Marathon in September and is ending the journey at the New York City Marathon on Sunday, a project she told Reuters rekindled her joy for running two years since she quit professional competition. “I needed a goal again after a year of not running and reconstructive knee surgery – and post-pandemic and retire…
