system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Does the Hulk have flexibility and full range of motion? Or are his muscles so massive that he can barely raise his arm over his head?

does he need to stretch or do yoga to get/maintain flexibility?
gpt
Hulk's physiology actually alters Banner's bone structure as well as adding mass and muscle. Apparently regressing into a more primitive, apelike form which happens to provide more mechanically optimal application of muscular force. This would theoretically limit Hulk's range of motion and explain his "poor posture," BUT because of the Hulk's extreme strength, metabolism and psychology, the Hulk has no *actual* "limit" to his flexibility because tearing cartilage and tendon isn't actually a deterrent to moving into whatever position he wants.

Professor Hulk seems to have a more modern, upright posture, but he also seems slightly less "Hulk-like" in many other ways as well. The same applies here, though. His massive musculature may somewhat impede his ROM, but he can ignore the resistance, possibly bruising muscle and tearing tendons, healing the damage almost immediately.