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Periodic limb movement disorder-A disorder characterized by involuntary flexion of leg muscles, causing twitching and leg extension or kicking during sleep.
This complex dance step combines an arched back with a leg extension or kick.
At home, lunges can take the place of the leg extension machine.
The quadriceps are located in the front of the leg and provide leg extension.
It's interesting to note that many gym members inadvertently create hamstring/quadriceps muscle imbalances by over-using the leg extension machine.