When you go to the gym to work out or are working with a trainer, you think about all the muscles you want to improve, the "look" you may want; how you want to get stronger or rehabilitate a certain part of your body. Physical activity- whether it be cardio, strength training, yoga, Pilates or group classes, are all great for overall health. Some specific benefits of these activities are: improving cardiovascular fitness, decreasing body fat, increasing bone density and muscle mass, lowering cholesterol and blood pressure, increasing your overall mood and productivity. Exercise can even lead to a longer life! What is not to love about all of that.
When you are doing physical training, you are training more than your body and your muscles and your heart and your lungs. To me, the most important thing to not forget to train is your brain.... I call it, "Mind over muscle". I have recently read a book called How Bad Do You Want It and it specifically talks about how people can overcome their physical challenges by mental training.