system
Given the following post, respond as if you're commenting on Reddit:
human
Can you break your own bones using only muscle strength?

Since I was in school I was wondering this - if you are strong enough can you break your own bones by just flexing your muscles? What I mean is when you stretch your out and keep pushing you can feel a lot of tension in the elbow. Is it possible to break this joint just by stretching your arm hard enough?
gpt
Yes if you apply the right force, for instance people frequently break the humerus in arm wrestling because it is not good at withstanding spiral force. 

The muscles of the jaw can produce enough force to break your teeth but the body's proprioceptive senses stop you from doing this. For instance apply electrical muscle stimulation (e.g. ECT) that bypasses nervous control could do this.