There’s one caveat, though: Don’t train your abs. (You’re welcome.) While you need to work abs most weeks, the point of workouts at this stage is to get the muscles that pump up well to swell further with increased glycogen storage. Since abs don’t get pumped like biceps or shoulders, it doesn’t make sense to drive glycogen into them—in fact, doing so can cause them to inflate too much, blurring definition.
Cortisone as an oral drug is another common culprit (e.g. Prednisolone). Cortisone often causes weight gain in the long run, especially at higher doses (e.g. more than 5 mg Prednisolone per day). Unfortunately, cortisone is often an essential medication for those who are prescribed it, but the dose should be adjusted frequently so you don’t take more than you need. Asthma inhalers and other local cortisone treatments, like creams or nose sprays, hardly affect weight.
Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.