The Great Change

Let me tell you a secret about myself: I love exercise!
I exercise three times a week: Monday, Wednesday, and Friday. I go to the gym, which is at my university, and then I start "playing in my playground". Everyone knows exercise is very important for staying healthy. In addition, it helps us to keep in fit (that is my favorite part.) 
I noticed that since I started working out I felt better and more lively. Besides, the way I used to eat was quite bad and because of that I decided to change some things in my diet. You know we can't workout and, at the same time, continue eating food with a lot of calories. It's totally stupid! Now, as I burn a regular quantity of calories, I get hungry rapidly. For a person who was not used to eating so much, this is a big deal. Therefore, I am satisfied with my new lifestyle and hope to keep focused as well as reach all my goals.

Wow, good for you! I agree: the more you exercise, the more energy you have and lively you feel. Keep up the good work. The habits we make now will be so beneficial as we grow older. 

Also, very nice entry, interesting topic and good use of varying sentence styles.