Rep challenges and other types of high reps workouts are very popular ways of training. In addition, competition style workouts where you have a leader board and try to complete your reps in the fastest time are also very popular. Unfortunately the fact is that these types of high volume, high reps workouts also have a higher risk of injury. Injuries happen most often when you are either excessively fatigued or you're not focusing. Both of these things things are far more likely when you're doing the last reps of an extremely high rep set of an exercise. You're far better…