The Functional Movement Screen Has a Gap, Here's What It Misses.

Many wellness professionals have used the Functional Movement Screen. It gives practitioners a shared language, a structured process, and a defensible reason to assess before programming. For many personal trainers and sports performance coaches, it replaced pure intuition with at least some protocol. That matters.

But a screening tool is not a musculoskeletal measurement system. And conflating the two leaves a gap that most coaches don't notice, until something goes wrong.

What the FMS Was Designed to Do

The FMS was built to identify movement dysfunction and asymmetry at the pattern level. It asks: can this person perform the fundamental patterns required for safe training? Pass or fail, with a numerical score attached. That is a legitimate and useful question. The problem is not what it measures, the problem is what it cannot.

Where the Gap Opens

The FMS tells you that a movement is restricted. It does not tell you by how much. It tells you an asymmetry exists. It does not quantify the degree of that asymmetry or track how it changes over time.

Consider a client who scores a 2 on the deep squat. They passed the threshold. But a 2 scored at 15 degrees of anterior pelvic tilt looks completely different from a 2 scored at 35 degrees. Both are a 2. The underlying mechanics are not remotely the same, and the appropriate intervention is not the same either.

The Repeatability Problem

When two coaches screen the same client with the FMS, they frequently arrive at different scores. Not because the tool is poorly designed, but because visual assessment of movement patterns introduces observer variability that no rubric fully eliminates.

Repeatability is the foundation of any objective movement assessment. If two practitioners cannot reliably produce the same result from the same input, you do not have a measurement, you have a shared opinion. That distinction becomes important when you are tracking client progress, justifying a program, or trying to understand why something is not working.

What Needs to Come After

The FMS is a useful entry point. It is not a sufficient basis for programming. What follows a screen should be quantified musculoskeletal assessment: documented angles, tracked changes over time, and a record that does not depend on who is in the room.

That means knowing the degree of restriction, not just that restriction exists. It means comparing the left hip to the right hip with a number, not an impression. It means having a baseline you can return to six weeks later and evaluate with something other than your memory of what the client used to look like.

This is not a criticism of coaches who use the FMS. It is a description of where the tool ends and where the work begins.

Measure First. Program Second.

Screening tells you whether someone is ready to train. Musculoskeletal assessments tell you how to train them, and whether what you are doing is working. Those are different questions, and they require different tools.

The gap in the FMS is not a flaw. It is a boundary. The coaches who get the best outcomes are the ones who know where that boundary is and have a system for what comes next.