RUNNING on flat and uphills nothing compares once you guys get on a routine of 2 miles a day then work it up to 5 miles a day or just average 4 miles a day will give you decent quad development as well as a good all around functional exercise that will tax everything. i run on the dirt track so its probably easier on impact but the hills are killer and the mileage will get to you , then maybe you get biggers will have some decent quads