well for being 19 training three people is good, i suggested sprinting because it puts jogging and walking to shame, basically better results, and at 19 ive spent thousands (literally) of hours reading everything i can from blogs to books to articles to people and also experience myself, ill be the first one to say certs dont mean jack in this industry, results do, which wont come unless you have experience (the right kind) and also knowledge on training, but anyways pebble im sure that you really have trained pros and all, care to name any? but i dont like to take advice from ppl that arent stronger than me soo, cya