Don’t work out later than three days before your event. If your party’s on Saturday, for example, do your last workout of the week on Wednesday—muscles bulge most when they’re flush with glycogen (the carbohydrates stored in muscle), so you need to give your body time to recover and replenish its glycogen stores before your unveiling. If you train too close to the big day, the carbs stored in your muscles will be depleted, and you’ll end up looking flat and soft. Furthermore, make sure this last workout focuses on the areas you want to highlight, such as chest and arms. Glycogen is replenished fastest in muscles that need it most—i.e., the ones that have just been worked—so if you want your pecs and biceps to pop, you have to make sure they soak up as many of the carbs you’re taking in as possible (explained in the next step).
In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.