Time Out says
Lace up those sneakers and hit the streets with fellow burger lovers at this free monthly event hosted by Shake Shack. There are two routes to choose from, both 3–5 miles long. Brooklyn residents will likely prefer the run along the Brooklyn Bridge Park piers, which begins and ends at the DUMBO Shake Shack (1 Old Fulton St). Manhattanites can converge at the Upper East Side Shake Shack (154 E 86th St) and hoof it into Central Park. Register online (or don't, it's fine to just show up) and sport a Shake Shack Track & Field t-shirt to get a free cup of frozen custard when you finish.