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 »

The quadriceps, also known as the thigh muscles, move the knee and the hip, and they prevent the knee from buckling. The quadriceps are engaged when doing squats, climbing stairs, standing up and walking. 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 »