Top 5 Reasons to Become a Personal Trainer It is a known fact that most employees hate their bosses. Although some bosses can be extremely unpleasant to work for, some employees hate their bosses because they resent themselves for working in a job that is nothing close to their passion and the things they love to do. On the other hand, personal trainers generally love what they do. No one would venture into this field if they didn’t like what it is all about.