What it stands for: American College on Exercise
There are many certifications a personal trainer can earn—as evidenced by the three lines of letters after his or her name on a business card—but one of the most common and respected comes from the American College on Exercise (ACE). The ACE exam requires personal trainers to pass an extensive written exam and to continue getting education certificates to maintain their license. While it's not the only certification out there, it's a good place to start when looking for a new trainer.
