You need to train your muscles to grow, and the best way to do that is with consistent workouts that slowly increase in weight and length. (roids.co)
With your consistency comes a catch: after about 6 weeks of consistent workouts, your body becomes more efficient, burning fewer calories while performing the same exercises. (fitbodyhq.com)
The reason: it requires not only consistent workouts, but an exceptionally clean diet most of the time. (fitbodyhq.com)