6.3 Overhead Squat Assessment

OHSA is the high-yield movement screen

The overhead squat assessment, or OHSA, is one of the most tested NASM assessment topics. NASM describes it as a dynamic movement assessment that gives a quick overall impression of functional status. It evaluates dynamic flexibility, core strength, balance, and neuromuscular control.

The screen should follow intake and static posture. If the client reports pain, dizziness, unsafe blood pressure, recent surgery without clearance, or another red flag, do not perform the assessment routinely. The first rule of OHSA is that the client must be appropriate for the test.

Protocol matters. Have the client remove shoes when appropriate, stand with feet shoulder width and pointed straight ahead, raise arms overhead with elbows extended and arms near the ears, keep eyes forward, squat at a natural pace to about chair height, then return to standing. NASM commonly uses about five repetitions while the trainer observes from the front and side, and movement specialists may also use a posterior view.

Do not coach the compensation away during the baseline. Demonstrate once if needed, then let the client move naturally. If you cue knees out or chest up on every repetition, the assessment may no longer show the client's default pattern.

Interpretation connects observations to probable overactive and underactive muscles. For example, knees moving inward can involve adductors, tensor fascia latae, and weak gluteal control. Arms falling forward may suggest tight latissimus dorsi or pectoral muscles and underactive scapular stabilizers. Low back arching can involve hip flexors, lumbar extensors, lats, glutes, hamstrings, and abdominals.

NASM's article emphasizes that the OHSA is not diagnostic. It helps the trainer let the body guide programming. The CPT should write possible or probable muscle imbalance language, then choose flexibility and activation strategies within scope. Pain or suspected injury still requires referral.

Two modifications help interpret common findings. If knees move inward, elevate the heels with a board or plates. If the knees improve, ankle mobility may be a major contributor. If they still move inward, hip weakness or control may be more likely. If the low back arches with arms overhead, repeat with hands on hips. If arching improves, latissimus dorsi extensibility may be involved. If it remains, core control may be the larger issue.

The applied programming rule is simple: lengthen probable overactive muscles, activate probable underactive muscles, then integrate better movement. For a beginner with multiple OHSA compensations, that often means starting in Stabilization Endurance, using regressions, and practicing clean patterns before heavy loading.

Exam traps include treating OHSA as a medical diagnosis, ignoring pain, testing in shoes when the protocol asks barefoot, and memorizing muscles without reading the checkpoint. Start with the observed compensation, then choose the safest next step.