TheoryPersonal Trainer Practice Test Video
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Q1During the concentric phase of a barbell back squat, which muscle group acts as the primary agonist to extend the knee?
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✓ Correct answer: Quadriceps
The quadriceps (rectus femoris, vastus lateralis, vastus medialis, vastus intermedius) are the primary knee extensors and drive the concentric upward phase of the squat, while the hamstrings and gluteus maximus act as agonists for hip extension simultaneously.
Q2A client performing a standing cable row demonstrates excessive lumbar extension during the pulling phase. Which muscle is most likely underactive, contributing to this compensation?
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✓ Correct answer: Transverse abdominis
The transverse abdominis is the primary stabilizer of the lumbar spine and pelvis; when it is underactive, the lumbar spine cannot resist extension forces generated by the pulling musculature, producing the observed hyperextension compensation.
Q3The shoulder joint (glenohumeral joint) is classified as which type of joint, allowing movement in all three cardinal planes?
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✓ Correct answer: Ball-and-socket joint
The glenohumeral joint is a ball-and-socket joint, granting the greatest range of motion of any joint in the body, permitting flexion, extension, abduction, adduction, internal/external rotation, and circumduction across all three planes.
Q4Tightness in the iliopsoas on the right side would most likely produce which postural deviation at the pelvis and lumbar spine?
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✓ Correct answer: Anterior pelvic tilt and increased lumbar lordosis
The iliopsoas attaches to the lumbar vertebrae and lesser trochanter; when chronically shortened, it pulls the lumbar spine into extension and tilts the pelvis anteriorly, producing increased lumbar lordosis — a hallmark of Lower Crossed Syndrome.
Q5Movement occurring in the sagittal plane around a mediolateral (frontal) axis includes which of the following?
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✓ Correct answer: Knee flexion and extension
The sagittal plane divides the body into left and right halves; movements in this plane (flexion and extension) rotate around a mediolateral axis, which includes knee flexion and extension, hip flexion and extension, and elbow flexion and extension.
Q6A sprinter driving powerfully off the starting block requires rapid, forceful hip extension. Which force-couple most efficiently generates this movement at the hip?
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✓ Correct answer: Gluteus maximus and hamstrings acting together
The gluteus maximus is the prime mover for powerful hip extension, and the hamstrings (biceps femoris, semimembranosus, semitendinosus) act as strong synergists; together they form the primary force-couple driving explosive hip extension during sprinting.
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