Hi! I would describe this component in my own words by saying component is flexibility by saying that the three components of flexibility are muscle elasticity and length, joint structure and nervous system. Yes, these components of fitness are very important as they help us do the things in our daily lives. I would say the nerve system is more important than the rest with the joint structure coming in second place. We need the nervous system because they they transfer nerve impulses between the parts of our body. I hope this is what you were looking for, Goodluck!