This is a great jogging stroller for someone who justs wants to walk fast or lightly jog. I am not a serious runner - just a mom looking to get some exercise! My son is large for 15 months and fits very comfortably in the seat. I agree with other posts that the harness system is fairly basic and not the easiest to adjust, but it is safe once it is on and I have had no problems with it. The basket underneath and the parent tray are nice features; the stroller is easy to maneuver and it is a nice ride over many different terrains. My son is not jostled all over the place. This is a great jogger for a great price!!