Before your interview, do yourself a favor and sit down to write out your goals. You may just have one big dream to train famous athletes or maybe you want manage the sales team at Under Armour. Even if your goal is outside of the sportswear industry, all you have to do is find a way to connect the dots. If you want to be a personal trainer, talk about how working in the sportswear industry will help you cultivate your sales skills to eventually build your own business. Make sure you show that you are invested in the company and not simply using this as a stepping stone. That may be reality, but the company wants to feel warm and fuzzy about hiring you. They want to know you are going to stick around for a while, so say something to compliment the company: "Working on your team will give me the confidence and motivation to do "X" by helping me improve my "Y" skills."
"Working on your team will give me the confidence and motivation to do "