One small word of advice, Personal Training as a profession has the highest rate of passing std's. So be careful which milf's you decided to smash
On a serious note, if your already in school for kinesiology there prob isnt much that an ACE certification will teach you, but it will look good on a resume. I believe the course is 600 bucks, and you get to take the test once, if you fail its another 100 or so to take it again. Its not a bad idea, but make sure you read all the materials, as some of the info for ACE will be contradictory to what you know an practice.