Okay, so there was quiet a bit of terminology that some of you might not have been familiar with in this particular activity but here are the key points. Muscle force is under central nervous system control at both the muscle fiber, and whole muscle level. A motor unit is the smallest functional structural unit of force production, and one neuron controls several muscle fibers. The central nervous system uses the motor unit to increase the force of a muscle in one of three ways. It can recruit more motor units. It can increase the frequency of motor unit firing, this is the rate coding. And it can synchronize the firing of multiple motor units, so as many fibers as possible in the muscle simultaneously contract. And this is called synchronization. There are fast and slow motor units, with the fast motor units producing the highest level of force. And the motor units are recruited in order from slow to fast. Train intermuscular movements. Don't train individual muscles. So now we've completed some of the key things you need to keep in mind to ensure specificity of strength into power training. So the effects transfer to improving an athlete's sports performance. Next, we take a look at acute fatigue. That is the unwanted phenomenon faced by all athletes when they're training and competing. In 1906, Italian physiologist Angelo Mosso, who was one of the first researchers to study the physiology of fatigue made the following comment about the phenomenon. What at first sight might appear an imperfection of our body, is on the contrary one of its most marvelous perfections. Whether the athlete likes it or not, fatigue serves a protective function as most have pointed out many, many years ago. There are four lessons, each providing you with valuable insights into how acute fatigue occurs during training, and competition, and the consequences of this fatigue. Then talk about fatigue theories first. Well talk about fatigue due to low fuel supplies. Fatigue due to acidosis. And the fatigue affects of temperature. We're going to begin the next lesson by discussing fatigue theories.