I'm 14 and I take soccer very seriously. Over the past years i've been playing mostly on the right wing until this year when the coach put me on the left. I thought that this would be a good time to work on my left foot. Except I don't know how to improve the strenght of my left leg, I know I should control the ball and shoot it more with my left, but I don't know how to physically make it stronger. What simple exercises can I do???