Arm Muscle

I noticed something awfully strange about my arm muscle/tendon/whatever.

If I press my forearm tightly against my biceps, about 2 seconds later, I will feel a tingle, and it feels extremely weird, and somewhat painful.

If I pull my forearm away from my biceps, I feel a strong pull, as if something is about to snap, and then it goes away.

I've only done it a few times, mostly by accident, because I don't want anything in my body snapping on me.

Any explanations?

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