If you like working with people and spending time at the gym as well as have an affection for fitness, you should become a personal trainer.  There is a growing demand for personal trainers in the health industry and this is a vocation in which you can not only help others, but also continue to improve your own health as well as maintain your body.  You should like people before you attempt to become a personal trainer, and be comfortable working around them.  You should also like fitness in order to become a personal trainer as this is what you will be promoting.  If you are both comfortable with fitness, enjoy working out at the health club and talking to people as well as helping them achieve their goals, you should seriously consider a career as a personal trainer.