Chopstix,If you are also biologically 15 you have many more years of growth and have not reached your final growth potential that arrives at biologically 19 yo, then you can train every day for what will then take 2 years to get into peak shape if no stops in training are used. With sports the best way to train is “Sport specifically” that is right at the top of the exercise physiological tenets. The best strength training for players is iron ball and wrist weights to cover the overload principle. The best underload training for an outfielder -catcher is throwing the baseball no higher than a catcher throws down to second maximally every day after a vigorous warm up.
If your outfield throws (and long toss) crowstep mechanics are correct by starting counter rotation of the body and stepping the ball side leg in front of the glove side leg you will achieve the correct arrival of your ball arm to driveline height (elbow and hand at ear height straight back (thumb up) supinated.) that will allow you to then transition (elbow now turning up) very early at the back attaining your last 90 degrees of outwards rotation to throw a direct pronated backspin, horizontally axised rotating ball with equated axis (12/6) presentation then finish with arms, shoulders, hips and legs 180 degrees from start
If your outfield throw mechanics has your ball leg step behind the glove leg you will start centripetal imperative that will give you not only an injurious gateway late transition mechanic it will impart forwards axis presentation on your release as Cadad and coach May have warned you about and told you how to check.
If your Catchers throw mechanic is traditional you will be susceptible to all the pitching type injuries from counter rotating to far causing centrifugal drive (3/4 arm slot)late transition and arm across the peck at finish
This crowstep catchers technique can be used in a catchers throw and is quicker, produces more release velocity, better flight time and more healthy than the traditional way but you will probably not be allowed to use this technique.
http://www.youtube.com/watch?v...L&videos=nLdEzKE5ZrII had a catcher 15 years ago at SCHC who used this technique that did not possess velocity but could throw out the fastest runners by 5 feet. We always tried to change him to the traditional high guard counter rotation throw, which made him worse. Since his dad the head coach of Saddleback JC (coach Adair) had taught him this crowstep version we decided to leave him alone and he proceeded in making all league by his senior year and nobody ran on him because he had a reputation for throwing runners out.
Now I understand that what I always fought before actually was far superior!