NASM Certified Personal Trainer · Assessment
NASM Certified Personal Trainer: Movement and Posture Assessment Concepts
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Overview
This chapter covers how a trainer looks at movement and posture to find problems before building a program. The main tool is the overhead squat assessment. The exam asks which muscles are likely overactive (tight) and underactive (weak) for each problem you see.
In the overhead squat assessment, the client squats with arms raised overhead while the trainer watches from the front, side, and back. The trainer looks for compensations, which are changes from ideal form. Each compensation points to muscles that may be overactive or underactive.
When the knees move inward, the adductors (inner thigh) and the tensor fasciae latae (TFL) are likely overactive, and the gluteus medius is likely underactive. When the low back arches, the hip flexors are likely overactive, and the glutes and deep core are likely underactive. When the arms fall forward, the latissimus dorsi is likely overactive.
Two common posture patterns appear on the exam. Upper crossed syndrome means rounded shoulders and a forward head. Lower crossed syndrome means an arched low back with the pelvis tipped forward.
Key concepts
Overhead squat assessment
A movement test where the client squats with arms overhead. The trainer looks for compensations from the front, side, and back to find likely tight and weak muscles.
Memory tipOne squat shows the whole body: feet, knees, hips, back, and arms.
Overactive vs. underactive
Overactive muscles are tight and do too much. Underactive muscles are weak or slow to fire. Programs stretch overactive muscles and strengthen underactive ones.
Memory tipOveractive = roll and stretch. Underactive = strengthen.
Knees move inward
Likely overactive: adductors (inner thigh) and TFL. Likely underactive: gluteus medius, which normally helps keep the knees in line.
Memory tipKnees cave IN because the inner thigh pulls in and the side glute is weak.
Low back arches
Likely overactive: hip flexors. Likely underactive: glutes and deep core muscles.
Memory tipTight hip flexors pull the pelvis forward, and the back arches.
Arms fall forward
Likely overactive: latissimus dorsi (and chest muscles). These muscles pull the arms down and forward.
Memory tipThe lats pull the arms down like a pull-down machine.
Upper and lower crossed syndrome
Upper crossed: rounded shoulders and forward head. Lower crossed: arched low back with the pelvis tipped forward.
Memory tipUpper = shoulders and head. Lower = low back and pelvis.
Often tested
- Knees moving in points to a weak gluteus medius, not a weak inner thigh.
- Low back arching points to tight hip flexors.
- Arms falling forward points to tight lats.
- Rounded shoulders with forward head is upper crossed, not lower crossed.
Easy to confuse: Overhead squat findings
| What you see | Likely overactive | Likely underactive |
|---|---|---|
| Knees move inward | Adductors, TFL | Gluteus medius |
| Low back arches | Hip flexors | Glutes, deep core |
| Arms fall forward | Latissimus dorsi, chest | Upper back muscles |
3 sample questions
Verified practice questions from this unit.
Question 1. What is the main purpose of the overhead squat assessment?
- ① To test maximal leg strength
- ② To find movement compensations in the body
- ③ To measure resting heart rate
- ④ To measure body fat
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Answer: ② To find movement compensations in the body
Key point: Overhead squat finds movement compensations
The overhead squat assessment shows how the body moves as a whole. A trainer uses it to spot compensations and plan corrective work.
Wrong choices
- To test maximal leg strength: It does not measure maximum strength.
- To measure resting heart rate: It does not measure heart rate.
- To measure body fat: It does not measure body fat.
Question 2. Rounded shoulders with a forward head posture is called which pattern?
- ① Upper crossed syndrome
- ② Lower crossed syndrome
- ③ Pronation distortion syndrome
- ④ Scoliosis
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Answer: ① Upper crossed syndrome
Key point: Upper crossed = rounded shoulders + forward head
Upper crossed syndrome includes a forward head and rounded shoulders. It involves tight chest and neck muscles and weak upper back muscles.
Wrong choices
- Lower crossed syndrome: This pattern involves the hips and low back.
- Pronation distortion syndrome: This pattern involves the feet and knees.
- Scoliosis: This is a side-to-side curve of the spine, not this pattern.
Question 3. In an overhead squat assessment, the client's knees move inward. Which muscle is likely underactive?
- ① Adductor complex
- ② Tensor fasciae latae
- ③ Gluteus medius
- ④ Vastus lateralis
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Answer: ③ Gluteus medius
Key point: Knees move in: glute medius is underactive
When the knees move in, the adductors, TFL, and vastus lateralis are often overactive, while the gluteus medius and maximus are underactive.
Wrong choices
- Adductor complex: The adductors are likely overactive.
- Tensor fasciae latae: The TFL is likely overactive.
- Vastus lateralis: The vastus lateralis is likely overactive.