Simply put, yes. I would recommend a burnout for just about any workout. For larger muscle groups I like to do a low weight, warm-up set; 3 set of increasing heavy to heavier weight; and one of medium weight to failure (burnout). On smaller muscle groups (shoulders in particular), I burnout after just about every set. Usually because I like to increase weight and decrease reps and this makes it easier to burnout after every set once you find out what weight to use. I think pushing your muscles to their limits (in a safe, controlled manner) is the only was to really make muscle gains. However, I would NOT recommend this for legs, like juice said, this risk of injury is just too high. Also on squats, you could be risking a hernia and that's just unbearable to think about. Also you could kiss working out goodbye for the next 6-12 months.