When there is stress but no actual danger, a person can be left feeling restless and irritable. This is partly because adrenaline causes the body to release glucose , raising blood sugar, and giving the body energy that has no outlet. Many people find it beneficial to "work off" the adrenaline rush after a particularly stressful situation. In the past, people handled this naturally through fighting or other physical exertion, but in the modern world, high-stress situations often arise that involve little physical activity. Exercise can use up this extra energy.
In the prequel, Batman: Arkham Origins , Bane is the leader of a gang, providing some of his chief lieutenants with venom tanks that they can use in their fights with Batman, albeit with a comparatively limited physical effect; none of the henchmen shown using the venom demonstrate anything more than a conventionally muscular physique. Bane is originally shown as a very well-built, sumo-wrestler-esque figure, but develops into the mutated state depicted in earlier games when he gives himself a large dosage of a Titan prototype, the drugs subsequently damaging his mind and apparently erasing his memory of Batman's secret identity.