Marcelo briefly shares a key detail about how to make yourself feel heavier and become more stable on top: If you can integrate your core and re-align your barycenter while establishing top position, or when reacting to an action from your opponent on bottom, e.g. a sweep or recovery, you can increase your chances of success by arching your back and projecting your weight. The resulting curvature taken by manufacturing the posture of a reverse hollow-body hold will reduce the magnitude of any trajectories from both unanticipated and expected movements imposed by your opponent. Arching tends to pull your center of mass farther away from your opponent, creating a helpful increase in counter-torque against their control.