Watching all the YouTube videos in the world and reading all the fitness magazines are no substitute for having a person by your side providing immediate feedback on form and technique. It is very easy to hurt yourself in the gym. Trainers pay attention, cue both mind and body, and help achieve goals more quickly by making sure you are doing each exercise correctly. They can help develop better running form, improve posture, and increase strength by teaching you to recruit the proper muscles and make a mind-body connection. With each exercise, trainers will coach you on proper form and technique preventing injury.