It starts with your eating habits, exercise can speed up the process and will help your overall health and energy levels.  A few years ago I started eating 6 small meals a day (around 300 calories each, all well balanced meals), and was very disciplined sticking to that diet.  I also did the Insanity workout from Team Beach body...I lost around 40 pounds in a few months.

 

From there I became less strict but my overall lifestyle had completely changed.  I've been maintaining a healthy lifestyle and weight now for several years; it's just part of my routine now.  

 

You must be disciplined, and make no excuses.

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