In my routine I have what you would call a leg day, very similar to Carnal's suggestion: Squats, Front Squats, weak point exercise. I was just wondering what you guys think are good substitutes to mix things up with. I hit a wall in my squat these past two weeks and I'd like to shock my legs for a few weeks. I've read a little about piston/pistol? squats? I don't know what they are. Any help would be appreciated.