Shalane Flanagan's feat of running marathons on back-to-back days is 'frankly inhuman' Posted Nov 6, 2021 Shalane Flanagan is just days away from achieving the impossible: running each of the world's six major marathons in under three hours — all in 43 days. To the common person, the feat seems otherworldly. Even top competitors in distance running, like marathon star and Olympic bronze medalist Molly Seidel, see what she's doing as "inhuman." (Insider.com)