How it connects

One date. Four apps that answer to it.

Anyone can draw four boxes and an arrow. Here is what actually changes — in each app, for four things that happen to every training block.

Your race moves four weeks later

Everything downstream re-dates itself.

XR Fit: Rebuilds the block around the new date — the build phase stretches, the taper slides with it, and peak week lands where it should.
XR Fuel: Carb-loading moves too. The week that was race week goes back to normal targets.
XR Kitchen: Next week's prep list follows the revised targets, not the old ones.
XR Health: Nothing. Your markers don't care what the calendar says — which is the point of tracking them separately.

You miss a week — work, illness, life

The plan absorbs it instead of pretending it didn't happen.

XR Fit: Re-entry is graded rather than resumed. You come back at the load you can hold, not the one the calendar says you should.
XR Fuel: Targets come down with the training load. A rest week eating like a build week is how a missed week becomes a bad month.
XR Kitchen: A smaller shop. The prep list scales to what you'll actually eat.
XR Health: Logs the gap, so the next set of markers is read against a real block.

Race week arrives

Four apps do four different things, on the same date.

XR Fit: Volume drops, intensity holds. The taper is the workout.
XR Fuel: Carbs up, hydration up, and the targets say so days ahead — not the night before.
XR Kitchen: Prep is built around travel and race morning, not a normal week at home.
XR Health: Quiet. Race week is not when you change anything.

A marker comes back outside its range

Training has somewhere to be explained.

XR Health: Shows the marker against your training load over the same months, so a bad block and a bad number can be looked at together. It records what you and your clinician decide — it does not recommend anything.
XR Fit: You have the load history to bring to that conversation, not a vague sense that training felt hard.
XR Fuel: Intake over the same window, for the same conversation.
XR Kitchen: If your clinician changes what you eat, the prep list changes with it.

Where this is true today

XR Fit is on iPhone now. Fuel, Kitchen and Health are in build, so the chains above describe the system as it is being built, not as it ships today. We would rather show you the argument and tell you where it stops than describe four apps in the present tense and let you find out.

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