I just did the 6.2 mile loop at Central Park. I did not think it was tough at all. I had been practicing for the big hill in CentralPark with some hills near my house in anticipation of a really tough hill. The hills I do at home are harder. I had my hd hero pro camcorder on my helmet and recorded the whole trip. It was definitely fun with bikes, runners, walkers, horses, skateboards, rollerbladers etc.