I have raced and trained in a few big cities. I also consider Frankfurt a big city because of all the stuff that is clumped on. If you watch the video this is a daily disaster waiting to happen on way too many levels. Joggers often have a watch or heart rate monitor and they know their run is almost over and will completely change directions, 180 or exit the park using a right angle to the open road bike path. Prospect is a little safer but not any more interesting. There were recumbents , joggers, strollers, golf carts, cars, tourists all on a route where a guy is flying, pretty f-cking dumb. The two places that no racing cyclist should be doing speed work are Prospect or Central Park. Yes going to Floyd or 9w is harder but come on..if either guy hits a stroller or old man while crushing 500 watts the end is result is tragic. Tragic also is allowing idiots to spray paint. Are you one of the people that spent 1600 bucks on the Brooklyn bamboo bike class?