The Baby Jogger Performance Series Single features the only one-piece frame in the industry, which means there are no hinges or joints to weaken during frequent high intensity use. The large 20 wheels make them one of the easiest joggers to push on the market today – allowing you to run farther with less effort. Its sleek aerodynamic design and shock absorption system make it easy to maneuver whether going over rocky terrain or for a jog on the beach.