I have been walking 2.5 miles every other day, doing cardio and thigh slimming workouts. Am I simply overdoing it or is this all part of fitness training..Cutrightmr: I really believe it IS the thigh slimming workout. Because my legs hurt from the upper thighs to my knees. When I suggested this to a friend, he said, "Walking 2.5 miles was the reason)