Why am I gaining weight while working out? Follow @CoachFabs

Nothing taps your panic button quite like gaining weight, especially when you're on a weight loss program. Unfortunately, it's an inevitable fact of life. Luckily, you've got me here to tell you that, as long as you're following a solid program, results will come. It's a physiological certainty (unless you have an underlying issue, like hypothyroidism).

Let's look at five of the most common weight loss problems:

I'm following the program perfectly. Why isn't it working?! 

Cortisol is a word you should become familiar with, as it's a key factor here. Cortisol is actually a performance-enhancing stress hormone that serves an important function in survival situations. Unfortunately, when we force too much daily stress on our bodies, we shift into a state of chronic cortisol release. This can cause us to store excess fat as a survival instinct. While it sounds pretty dire, it's generally only a serious problem in those with poor lifestyle habits. 

The beginning of a diet and/or exercise program, however, is a survival situation. In a very simplistic sense, your body releases cortisol, which, in turn, causes excess water retention to help you rebuild broken down muscle tissue. While this is cortisol functioning properly, it does lead to a period of water weight gain as you adjust to a new program. It's nothing to worry about. By following a solid plan, your body will adapt by repairing this muscle tissue. This results in an increase in your metabolism and leads to weight loss if that's your goal. 

The trick is that there is no hard line on how long this adaptation takes. It's based on your individual parameters. Just rest easy in the fact that it will happen, unless you force it not to.

I'm barely eating.

Severe undereating causes cortisol release, as it's the definition of a bodily emergency.  A short period of strategic undereating with proper hydration will help your body dispense of unneeded food (most of us chronically overeat) and regulate bodily functions. Go too long, however, and chronic cortisol release is the result. 

I've been doing hard workouts for weeks. 

On the performance theme, you need to continually improve, which is why workouts get harder as you move through any of Beachbody's programs. It's also why we add resistance (via added weight or gravity, as is the case with jumping) to workouts. If you're doing the same workouts at the same intensity constantly, you are not forcing adaptations that lead to changes in your metabolism. This is called a plateau. 

A plateau, technically, isn't gaining weight—it's remaining the same—but a proper diet and exercise program should continually force improvements (in the form of adaptations). Otherwise, your metabolism won't continue to increase, which is the goal of most weight loss programs.

My friend and I are doing the exact same thing and he/she's losing. 

Back to adaptation. We all react differently. The only absolute is that our bodies will change over time with a healthy program. A fitness rule called the Specificity of Adaptation states that it takes the body between 3 and 12 weeks to adapt to new stimuli, which is a very broad range. This is why it's vital that you stick to your program and not change it repeatedly based on your daily results! 

I lost weight for a while but now it's stopped. 

You eat less to lose weight. Things are going great, but suddenly you plateau—or start gaining. Odds are, your metabolism has slowed down in order to deal with the decreased calories. You're starving your now fit body, so it's doing what it needs to do to survive. The answer to this problem is pretty simple: eat more.