Almost everyone is talking about metabolic health. Almost no one defines it well enough to test. In the gap, proxies and products offer answers without a way to test whether they worked.
The body, meanwhile, is producing evidence the whole time. The Radar is a way to read it.
There is no shortage of answers. A supplement protocol. A wearable score. New bloodwork with a few numbers flagged. A diet someone read about. A body composition reading. Each one carries some signal. None of them, on its own or stacked together, gives an operational answer to the question that actually matters: is this person becoming more capable over time?
The supplement aisle has an answer. The wearable has an answer. The wellness deck has an answer. The lab range has an answer. None of them agree. None of them are accountable to the next measurement.
"In range" is a population statistic. It tells you a body is not yet sick. It does not tell you a body is well. Diagnosis is not health. The absence of a diagnosis is not the presence of capacity.
Three jobs the body has to do to stay well. Each one is trainable. The Radar organizes twelve measurements into these three capacities; the markers are clues about each capacity, mostly taken at rest, and they do not directly measure every part of it. Read all three together. Any dip gets a closer look. Hover a capacity to see it on the Radar below.
Can this body handle fuel and return to baseline? Food is not just calories. It is signal and material. The question is whether the current mix of protein, carbohydrate, fat, and timing creates stability or chronic exposure.
Can this body take a hit and come back? Training, sleep loss, work stress, and life stress all draw from the same recovery budget. The question is whether stress becomes adaptation or accumulates as debt.
Can this body keep its options? Bone, strength, body composition, and visceral fat tell us whether the person is building reserve or slowly narrowing their world.
The Radar is not one score. It's a shape. Twelve numbers laid out where the eye can read them at once, organized so strain shows up as a dent and reserve shows up as a wing. In two seconds you can see where it dips and where it is carrying you. Each marker is placed on its axis by an age- and sex-adjusted curve; a capacity reads as the average of its four markers, and no capacity average hides a single marker sitting at a clinical line.
That's the whole claim. Run it once and you have a first guess about where the work goes. Run it again twelve weeks later and the body either backs you up or argues with you. We adjust accordingly.
This is what coaching looks like when it's accountable. You don't get to say the plan worked because the person feels better. You can't say it failed because the scale didn't move. You make a prediction about which markers should change, in which direction, by when. Then you re-test on the same body, with the same protocol. If they moved the way you predicted, the guess is supported — not proven. You still ask whether the move is bigger than the noise, what else changed, and what it cost. If they didn't move, or moved the wrong way, you say so and change the guess.
The definition gives the model. The series explains the three capacities. The one-pager turns the framework into a reference you can actually use.
A definition of metabolic health a coach can use, plus the three capacities, twelve markers, and the Radar framework.
The science goes under the hood. Three essays bring the framework back to food, training, recovery, and functionality.
A printable reference for the definition, three capacities, and marker framework.
CF-L4. Owner, CrossFit Santa Cruz, since 2008. MetFix Academy Staff. Former CrossFit Seminar Staff, 2007–2025. Creator of the Metabolic Radar.
Twenty years on the gym floor. Eighteen of them teaching other coaches how to coach. The Radar is my attempt to bring the same operational rigor I have always cared about, definition, measurement, repeatability, and a willingness to be wrong, into metabolic health, where the standard has been missing.
Bring your bloodwork, body composition, and vitals. We'll read them across the three capacities, the whole shape, and make a guess about what to change first. Then we change one thing, test again, and let the body tell us whether the guess was right.