I workout my legs about twice a week, and although they are well defined they are very skinny. I am pretty skinny, but my upper body has more mass to it. I know I am probably doing too many reps: i do about 4 sets on squat at ten to twelve reps, and then do the same on leg press. I should probably up the weight and do less reps but I get scared without a spotter. Any tips from someone who knows what they're doing would be great. I do take weigh protein, don't take creatine, and would never even consider steroids.