After several failed attempts, you end up feeling frustrated and let down because it is so much harder to achieve your fitness goals than what you've been told.
But, the problem isn't you.
The real reason most people start workouts and then give up and get back out of shape is because the workout model is broken and packed with outdated and just plain wrong information.
Until now, the only way to get in shape was to join a big box gym and try to figure out a workout routine that works for you... or order a workout DVD from an infomercial at 11:30 at night and try to go at it alone, without motivation, at home.
In both cases, you are destined to fail.
You see, the big problem with those options is that there is no accountability and real motivation. You don't have someone who cares as much about your goals as you do, helping you every step of the way and motivating you.
And without professional guidance, motivation, and accountability - you're doomed.