What's this weird thing I can do with my hand?

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The discussion centers around a unique physical ability involving the movement of tendons in the hand, specifically the extensor tendon over the metacarpophalangeal (MCP) joint. The individual reports being able to trigger this movement by pressing the fourth finger onto the palm, which does not cause pain even with continuous action. A participant named Greg confirms that this movement is indeed the lateral shifting of the extensor tendon, noting that the tendon sheath for the fourth and fifth digits is less developed than that for the second and third digits. This anatomical difference allows for the observed movement, suggesting a loose tendon sheath that facilitates the back-and-forth motion.
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Here's a video: https://www.youtube.com/watch?v=iHtIPbYK_EI

I have been able to do this for as long as I can remember, and only on my right hand.
The action that I do to trigger this thing involves pressing my 4th finger onto my palm.
Doing this doesn't hurt even if done continuously. Any ideas what this is?
 
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Looks to me like your moving the tendons from side to side over your knuckles?

hand_muscles.jpg
 
Greg is correct, you are moving your extensor tendon over your MCP joint. As you can see in Greg's picture the sheath over the 5th and 4th digit extensor tendon isn't as developed as the 2nd and 3rd digits. Yours seems to be loose enough you can move it back and fourth.
 

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