According to About.com, the quadriceps are the primary muscles used in leg extensions. The quadriceps are located on the front of the thighs and include the rectus femoris, vastus intermedius, vastus lateralis and vastus... More »

According to AZ Central, seated leg extensions work the four muscle heads of the quadriceps, which are in the upper thighs. Standing leg extensions also work the quadriceps and other abdominal muscles. AZ Central explain... More »

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To make a sewing extension table, trace a template of the sewing machine's free arm, and trace it onto an 18-by-24-by-1/2-inch piece of Plexiglas. Cut out the pattern, and then place the Plexiglas next to the free arm. M... More »

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The major muscles in the human upper leg are in two groups: the hamstrings and the quadriceps. The semitendinosus, semimembranosus and biceps femoris muscles comprise the hamstrings muscle group, while the rectus femoris... More »

According to JaxTrainer, a Jacksonville certified personal fitness training website, a study on leg extensions showed that men's legs are nearly 50 percent stronger than their female counterparts. The average 10-repetiti... More »

A person's thigh is composed of three major muscles: the quadriceps, hamstrings and adductors. Typically, when someone refers to the thigh muscle, the person is speaking about the quadriceps. More »

The thigh has three sets of strong muscles: the hamstring muscles in the back of the thigh, the quadriceps in the front and the adductor muscles on the inside. The quadriceps and hamstring muscles work in combination to ... More »