So far so good with the hip and the racecar, aside from the heat. I might have to add some padding to the seat though. I can say that a weedeater is the hips enemy! Holding that weight out there and pivoting especially on uneven ground will wear a hip out. Running didn't make my hip happy either! Really severe storms the other night from the high heat. I ran from the house to the shop and back in the storm, leg didn't like it. Good part now it seems it doesn't take as long to get over overdoing!