During the ascent phase of a squat, which describes the action of the quadriceps and gluteals?

• A. They shorten (concentric)
• B. They lengthen (eccentric)
• C. They remain isometric
• D. They are not involved

Answer: (A)

During the ascent of a squat, the quadriceps and gluteals actively shorten to extend the knee and hip, lifting you up from the bottom position. This shortening corresponds to a concentric contraction, which is how these muscles generate the force needed to rise. The opposite happens during the descent, when they lengthen under control (eccentric). They’re involved because both joints are actively extending as you stand up, not remaining the same length or staying inactive.