One of the truisms in this area is that you DO NOT work out to lose weight, or rather fat. The thermodynamics of the situation preclude being able to "burn off" those extra calories. So, one is predestined to failure if harbouring that mindset. One works out, in a very specific way, to change their body chemistry. Over time, and if done appropriately, your chemistry changes and the body becomes much more adept at burning fat. If an individual does not have the motivation to maintain a certain "fitness level" then I am afraid one is doomed to a lifetime of struggle, unless, of course, one is genetically gifted. The diet industry goes to the bank, literally, on this. LOSE TEN LBS. THE FIRST WEEK! Thermodynamically and biochemically impossible. Unless you are talking water weight. Ever see someone who lost weight quickly? Drawn, tired looking. They have lost their interstitial fluid volume (water). Which, of course, comes back when they go "off" the "diet". EXACTLY what you do not want to do. As with economics, there is no free lunch, even though people are constantly in search of it. For the average layman in this area read "Fit or Fat" by Covert Bailey. FANTASTIC as, in a very simple way, he explains what you need to know without using any words more complicated that fat, carbohydrate and protein. Just my 2 cents worth as I have a passion for this topic. I have 2 biochemistry degrees and am a certified fitness trainer.
By the way Pool, I agree that MyFitnessPal is terrific. Tracking diet is critical and this is a great app. Glad you found that resource. WeightWatchers is based on tracking as well. My GF works for them but the entire programme is of limited value.