Opening scene
There's a difference between memorizing a map and walking that city.
Over the last six lessons, you built a map. Three planes, six actions, a long list of direction terms. You read all of it, and you probably understood most of it.
Now I'm going to ask you a simple question, and odds are you won't know the answer.
What's your right hip's range of internal rotation?
You don't know. Nobody does, because you've never measured it. You learned the term, but you never saw what it corresponds to in your own body.
This lesson closes that gap. It isn't a reading lesson, it's a screening. By the end, you won't just have a map — you'll have the map of your own body.
What this lesson covers
First we'll go over why this screening isn't a test; the rules come from Y1.05. Then we'll build the concept of isolation, because measuring one action means silencing the others. After that, we'll lay out the structure of the screening: four stations, a few joints at each. Then you'll see what gets recorded and how. Through sixteen examples, you'll read the observations that come out of real screenings. By the end of the lesson, you'll have done your own fourteen-minute screening and created a record you'll compare against twelve weeks from now.
Starting point
This is not a test.
The distinction we built in Y1.05 applies here exactly: we don't push the limit, we record where the movement stops and how it stops. If your breath isn't breaking, you're in observation.
But this screening differs from Y1.05 in one way. There, you tracked six whole movements: forward folding, squatting, balance. Here, we're not measuring whole movements — we're measuring individual actions, one at a time.
Why does the difference matter? Because a whole movement is the sum of many joints, and when it gets stuck somewhere, it doesn't tell you which joint got stuck.
Isolation has three tools, and you already know all three from earlier lessons.
The first is the floor. Lying on your back, your torso has nowhere to escape to.
The second is the wall. Pressing your back against it blocks the ribs from flaring forward and the torso from tipping sideways.
The third is the opposite side. Measuring one leg while holding the other fixed limits how much the pelvis can rotate.
An isolated measurement always comes out smaller than a free one. Coming out smaller is the correct sign; you've seen the same thing in all three lessons of this section.
Mechanism
The structure of the screening
There are four stations, and the order is deliberate: it starts lying down and ends standing up. Here's why: the measurements that need the most isolation are taken in the position with the most support.
The first station is lying on your back. The hip is measured here, because the floor holds the pelvis in place.
The second station is seated. Torso rotation is measured here; the fixing you built in Y1.10 does its work here.
The third station is hands and knees. Spinal flexion and extension, along with chest-region rotation, are measured here.
The fourth station is standing, in front of a wall. The shoulder and ankle are measured here.
At each station: one minute of setup, two to three minutes of measuring. The total shouldn't go over fourteen minutes. If it does, fatigue mixes into the results, and the final measurements stop being comparable to the first ones.
What gets recorded
We're not measuring degrees. No goniometer, no ruler.
Instead, three things get recorded.
The first is the stopping point. Where does the movement stop? It's stated against a reference: "a hand's width before the knee touches the chest," "a handspan before the arm reaches the wall."
The second is the reason for stopping. Why did you stop? There are three options, and you make the call: was it a feeling of tension, was it pinching, or did the movement itself simply end?
This distinction does work. A feeling of tension usually comes from soft tissue and can change over time. Pinching can mean you've run up against something inside the joint, and you don't push there. The movement ending is a structural limit.
The third is the difference between the two sides. Are right and left the same? If not, which one is smaller?
Why pinching gets recorded separately
One of the three reasons for stopping behaves differently from the other two, and you need to know that.
A feeling of tension is usually a diffuse, tolerable sensation that increases as the movement goes further.
Pinching, on the other hand, is a more localized, "harder" sensation at the front or inner side of the joint. It usually arrives suddenly, toward the end of the range of motion.
We talked about bone congruence in Y1.02. Pinching is often the herald of that limit, and pushing there doesn't gain you range.
Practical rule: you stop where you feel pinching, and you write "pinching" in the record for that action. You don't push, you don't persist, and you don't make that area a program target.
If you can't get into a station
This screening uses four positions, and not all four are accessible to everyone. Getting down to the floor and back up can be hard, kneeling can be uncomfortable, and lying on your back may not be appropriate in some situations.
If you can't get into a station, the screening doesn't get canceled — the station gets moved.
The supine hip measurements can be done on a bed or a tall divan instead of the floor. Isolation weakens a little, but as long as it's repeated under the same condition, the comparison stays valid.
The hands-and-knees station can be replaced with a seated forward fold, hands resting on a chair. The spine does the same actions, and the load comes off the knees.
The standing shoulder measurement can also be taken seated in a chair, back against a wall or the chair's backrest.
The one rule that doesn't change: write down whichever adaptation you chose, and use the same one at week twelve. The principle repeated since Y1.01 holds here too; what makes comparison possible isn't the perfection of the measurement, it's the condition staying the same.
Safety
This screening is a physical practice, and its rules come from earlier lessons.
If a sharp, spreading, or numbing sensation shows up, that measurement doesn't get taken, and you write "stopped here" in the record. That's data too.
If your check-in card is reading low, the screening doesn't happen that day. The screening is taken on a usual day — the same rule we set for the baseline in Y1.01.
And the screening is taken after warming up, not before. A measurement taken on a cold body comes out both more limited and carries unnecessary risk. Five minutes of light movement is enough.
Reading the examples
Master layer
Now let's refine this a little.
I've described the screening like a photograph. In reality, a single screening's informational value is limited; the real value is in the difference between two screenings. That's why the first screening's most important property isn't its accuracy, it's its repeatability. A measurement that's a little off but can be repeated under the same conditions is worth more than one that's very accurate but can never be taken the same way again. Write down the conditions: what time, whether you'd warmed up, which day.
Second nuance: the act of measuring itself teaches. What we said about observation in Y1.05 holds here too, and more strongly. A person isolating their hip's internal rotation for the first time is feeling that action for the first time. Part of the increase that shows up at the second screening isn't tissue change, it's the skill of finding that action. This isn't contamination, it's a real gain; but note it down if you want to know what's what.
Third, the limit of targeting the most restricted direction. The screening produces a "weakest link" list, and intuition immediately says to work that one. Most of the time it's right. But if a direction is restricted and its limit is structural, targeting it produces no result and burns out motivation. The reason-for-stopping record exists exactly to make this call: a direction that stops with tension gets targeted, a direction that stops with pinching doesn't — its surroundings get worked instead.
Fourth, and subtlest: this screening isn't a health assessment. What you're measuring is range of motion, and range of motion by itself doesn't decide anything about health, performance, or injury risk. A low value isn't a diagnosis; a high value isn't a guarantee. The screening exists so you can see your own change over time, not so you can compare yourself to someone else or give yourself a label.
Common mistakes and misconceptions
Common mistakeFirst mistake: the screening should show how much I can do.
This turns the screening into a test and brings back every problem we talked about in Y1.05. What's being sought isn't the maximum, it's the comfortable limit and the nature of that limit. If your breath is breaking, you're already in a test.
Common mistakeSecond mistake: if the isolated measurement comes out low, something's gotten worse.
Isolation always lowers the number, because it cuts off the neighbors' help. A lower number isn't a decline, it's a measurement taken clean for the first time. Comparison only happens between measurements taken under the same isolation condition.
Common mistakeThird mistake: the most restricted direction should be targeted right away.
Making this call without looking at the reason for stopping can lead to pushing against a structural limit for months. A direction that stops with tension responds to work; persisting with a direction that stops with pinching usually produces no result and generates discomfort.
Common mistakeFourth mistake: low values mean I'm going to get injured.
Range-of-motion measurements have limited power to predict future injury, and there's no context-independent threshold. This screening isn't a risk calculation, it's a starting record; its only job is to make you comparable to your own past.
Practice
Keep in mind
This is a screening, not a test; the limit doesn't get pushed, the stopping point and the reason for stopping get recorded.
Measuring an action requires silencing its neighbors; the floor, the wall, and the opposite side do that work, and an isolated measurement always comes out smaller.
Degrees aren't measured; a reference-based description is more reliable and more repeatable than a degree taken at home.
The reason for stopping gives more direction than the measurement itself: a direction that stops with tension can be targeted; a direction that stops with pinching doesn't get pushed.
A single screening's value is limited; the real information is in the difference between two screenings, which is why the conditions get recorded too.
Bridge to the next lesson
In this screening, you isolated actions one at a time. But no yoga pose is a single action; every one is a set of actions working at the same time. In the section's final lesson, we'll reverse this: we'll take a pose, take apart every action inside it, and find which one is load-bearing. You've learned to isolate; now you'll learn to combine.