5 Overhead Press Mistakes That Lead to Shoulder Injury

Why the Overhead Press Injures Shoulders

The shoulder joint has the greatest range of motion of any joint in the body — and the least inherent stability. This combination makes it highly capable but also highly vulnerable to injury when loaded in mechanically disadvantaged positions.

Research published in the Journal of Shoulder and Elbow Surgery found that shoulder impingement syndrome is the most common overhead pressing injury, accounting for 44% of all shoulder complaints in strength training populations. The majority of impingement cases are caused by correctable technique errors.

Mistake 1: Bar Path Too Far Forward

What it is: The bar should travel in a vertical path directly over the mid-foot. A bar path that drifts forward (in front of the face rather than over the head) increases the moment arm at the shoulder, dramatically increasing the load on the rotator cuff.

Why coaches miss it: Bar path deviation of 3–5 cm is difficult to observe in real time. Coaches watching from the side focus on depth and lockout, often missing the bar path.

What AI measures: AI tracks the horizontal position of the bar (via wrist landmarks) relative to the shoulder position throughout the press. Bar drift greater than 5 cm in front of the shoulder at any point is flagged.

The fix: The "bar over the traps" cue — at the start position, the bar should be resting on the upper chest/front deltoids with the elbows slightly in front of the bar. Press the bar in a straight vertical line, moving the head back slightly to allow the bar to pass the face.

Mistake 2: Elbows Flared at the Start

What it is: At the start position, the elbows should be slightly in front of the bar — not flared out to the sides. Elbows flared at the start position internally rotates the shoulder, creating impingement risk throughout the press.

Why coaches miss it: Elbow position at the start is often assessed but not corrected because it feels natural to many lifters. The impingement risk only becomes apparent after months of pressing with this error.

What AI measures: AI measures the angle between the upper arm and the torso at the start position, flagging elbow flare greater than 75° from the torso.

The fix: The "elbows slightly forward" cue — at the start position, rotate the elbows slightly forward so they are in front of the bar rather than to the sides. This externally rotates the shoulder and creates a mechanically safe pressing position.

Mistake 3: Hyperextending the Lower Back

What it is: During the overhead press, the lower back should remain neutral. Hyperextension (excessive arching of the lower back) is a compensation for insufficient shoulder mobility and shifts the load from the deltoids to the lower back.

Why coaches miss it: Lower back hyperextension is partially hidden by the lifter's clothing and body position. Coaches watching from the side can identify severe hyperextension but miss the moderate arch that causes lower back pain over time.

What AI measures: AI measures the lumbar angle throughout the press, flagging hyperextension greater than 10° beyond neutral.

The fix: Brace the core before pressing and maintain that brace throughout the set. Cue: "ribs down" — actively pull the ribcage down toward the hips. This prevents lumbar hyperextension and keeps the press in the correct plane.

Mistake 4: Incomplete Lockout

What it is: At the top of the overhead press, the elbows should be fully extended and the bar should be directly over the mid-foot. Incomplete lockout (stopping short of full extension) reduces the training stimulus and prevents the shoulder stabilisers from developing strength at end range.

Why coaches miss it: Incomplete lockout of 10–15° is difficult to observe in real time. Coaches watching the overall lift often miss this subtle detail.

What AI measures: AI measures the elbow angle at the top of the press, flagging lockout less than 170° as incomplete.

The fix: The "press to full extension" cue — at the top of the press, actively push the bar toward the ceiling until the elbows are fully locked. Hold the lockout position for 0.5 seconds to build end-range stability.

Mistake 5: Wrist Breakdown

What it is: The wrists should remain neutral (stacked directly over the forearms) throughout the press. Wrist breakdown — where the wrists extend backward under load — shifts the bar behind the forearm's centre of mass, increasing wrist and shoulder joint stress.

Why coaches miss it: Wrist breakdown is subtle at moderate loads and becomes pronounced only at heavier weights. Coaches watching mechanics often focus on bar path and elbow position, missing the wrist angle.

What AI measures: AI tracks the angle between the forearm and the metacarpals throughout the press. Wrist extension greater than 15° under load is flagged.

The fix: Wrist wraps provide external support while wrist strength develops. Cue: "crush the bar" — actively gripping the bar hard engages the wrist flexors and prevents passive extension.

Using AI to Press Without Shoulder Pain

SportsReflector's overhead press analysis tracks all 5 of these errors simultaneously, providing a form score (0–100) with specific feedback on bar path, elbow position, lumbar angle, lockout quality, and wrist mechanics.

Download SportsReflector and press overhead with the confidence that your shoulders are protected.