When Baby Jogger set out to design the most advanced, high performance jogging strollers on the market, they did it with the serious runner's training regimen in mind – the marathon runner, the tri-athlete, and even the weekend 5k warrior. Baby Jogger knows how it is getting up at 6am for a training run with a child or children - you want to make sure you've got them buckled into one of the safest strollers on the market, and one that can take the miles and miles of wear & tear that you put on it. The Performance Series Jogging Strollers feature the only one-piece frame in the industry, which means there are no hinges or joints to weaken during frequent, high intensity use. Their 20 wheels make it one of the easiest joggers to push on the market today - allowing you to run further with less effort. The sleek aerodynamic design and shock absorption system make it easy to maneuver whether going over rocky terrain or for a jog on the beach.