You could be out for a run, just sitting in one position for too long, or even drifting off to sleep when it happens: a muscle spasm in your leg that leaves you gasping for breath and unable to move your leg. If you’ve ever been stopped in your tracks by a sudden ‘charley horse’, you will know that muscle cramps can cause severe pain. Though generally harmless, muscle cramps can make it temporarily impossible to use the affected muscle.

Californian, Angel Bermudez, filmed this 50-second clip while in agonizing pain following a gym session and captured the bizarre moment his muscles twitched as if something was alive under the skin. It was as if the muscle has assumed an alien life of its own.

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