Your athlete is performing a dumbbell biceps curl. During the concentric phase of this exercise, at a constant speed, the athlete realizes that the exercise is easy at the beginning (elbow fully exten

Your athlete is performing a dumbbell biceps curl. During the concentric phase of this exercise, at a constant speed, the athlete realizes that the exercise is easy at the beginning (elbow fully extended), more difficult in the middle (at 90 degrees of elbow flexion) and easy again at the end (at 135 degrees of elbow flexion). Explain why the athlete feels differences in external resistance during the concentric phase. If the client performed the same exercise with more speed, how would the ANGULAR MOMENTUM be affected? Explain by using concepts of biomechanics. 

(This kinesiology and it is a biomechanics class)