Some back story:
So in the first in a line of inevitable boss battles my band of misfit heroes must face a humanoid enemy that consumes humans (by dissolving them in a cocoon of acid, which he then sucks up like a spider). They come across him in a village, where he has cocooned the entire population. Every time he feeds he gains superhuman speed for a short while. On a level where the average person could still block most of his attacks, but not land a hit on him. Every time he starts to slow down, he runs away, feeds, and resumes his attack.
Each of my heroes has an artifact granting him/her control of an elemental force, resistance to said force and some physical improvements.
Kal has control over electricity, enhanced perception and increased intellect. At this point in the story his powers are limited to touch, so he can't just zap the guy. He reckons that by forcefully contracting his muscles in a sequence via electrical impulses, he can match the beastie in melee combat (both of them use blades mounted on or protruding from the forearm). He's around 1.7m (5"6) tall, weighing around 60kg (132 pounds), slender framed.
Now I rate this could work, but would take plenty of concentration as he would have to target specific muscles milliseconds after each other. The body would also be put under immense strain. Any damage can be healed afterward.
Kal only has to keep the creature busy for a few minutes so that it can't regain his speed. Allowing the rest to fight it on equal terms.
The question being: Could our hero's body survive several minutes of electrically forced muscle contraction or would this tear his muscles and joints apart on the first few attempts?