A watch won't win you an ATHX. It does decide what you'll know about your preparation — and over three months, that's what counts.
The problem is that an ATHX looks like nothing watches record natively. It isn't a run, it isn't a lifting session, it isn't a WOD: it's six zones back to back across 2.5 hours, only three of which score, with maximal strength blocks in the middle.
Here's what works, and what doesn't.
What a watch captures well
Continuous heart rate. It's the most useful data in your entire preparation, by a long way. It tells you what intensity you actually worked at, how you recover between blocks, and whether your Recovery zone did anything.
Durations and transitions. How long on each segment, how long between two. That's what builds your pacing.
Running, and GPS. For the Endurance 3 km, a watch does exactly what you ask of it.
Heart-rate recovery after effort. How fast your rate drops in the two minutes that follow is a readiness indicator few athletes use.
What it doesn't capture, and what not to hope for
Worth saying plainly, because it's what disappoints most often.
Loads and reps. No watch knows you've just made a 2RM at 140 kg. Automatic rep counting in the gym is unreliable on loaded movements, and it doesn't exist for a shoulder to overhead or a sandbag squat.
SkiErg and rower distance. The machines display that, not your wrist.
Calories, seriously. A watch's estimate on a 2.5-hour mixed strength/cardio effort has no usable accuracy.
⇒ The watch is a measuring instrument, not an input device. It records the structure — durations, sequencing, heart rate. The values — loads, reps, machine distances — get entered elsewhere, afterwards, calmly.
It's a split we accepted from the start: trying to enter a load on a 1.2-inch screen between two attempts means losing competition time for a number you can write down later.
The real problem: wearing the watch through the strength events
It's the most frequent piece of feedback from the field, and it deserves an honest answer.
On a heavy deadlift or a shoulder to overhead, a watch on the wrist gets in the way — the bar rubs, the case digs in. Some athletes take it off for the Strength zone.
Three solutions, in order of preference:
Wear it higher up the forearm, above the wrist. Optical measurement is less accurate there but still usable, and the interference disappears.
Wear a heart-rate strap and leave the watch in your pocket or in your bag nearby. That's the best signal quality, and it's the only option that gives access to heart-rate variability.
Take it off for the lifts and put it back on after. You lose the Strength zone's heart rate, which is the least interesting of the three in that respect. It's an acceptable trade.
⚠️ What not to do: wear the watch tight on the wrist through a heavy set hoping for a clean signal. Wrist compression under load degrades optical measurement.
Which watch to choose
There's no "ATHX special" watch. There are three criteria that matter.
Battery life. Two and a half hours of recording with GPS and continuous heart rate, plus the warm-up, is three hours. Every current sports watch holds that, but check yours isn't at 20 % on race morning.
Compatibility with a heart-rate strap. If you want the best data, it's essential. Almost every Garmin allows it.
The ability to install a third-party app. That's the point that changes everything, and we're coming to it.
In other words: if you already own a Garmin, it's probably fine. If you're hesitating about buying one, take the entry level of the sports range rather than the top of a general-purpose range.
The problem the app solves
A watch, natively, doesn't know what an ATHX is. You start a "strength training" or "run" activity and you get one undifferentiated 2.5-hour block.
There's nothing to be drawn from it: you don't know where the Endurance started, how long your transition took, or what heart rate you hit the Metcon at.
That's the problem we built ATmetrYX to solve. It's a Garmin app, available on the Connect IQ Store, and it knows the format.
Training mode — you work one pillar. You pick Strength, Endurance or Metcon X, and the watch records that pillar's run: each successful attempt with one press, each run → ski switch with one press, and heart rate continuously. It's the mode you'll use 90 % of the time, because 90 % of your preparation happens block by block.
Competition mode — the full simulation. The six zones in order, with their real durations, including the three that score nothing. The watch announces the transitions; you no longer have to watch a clock for 2.5 hours, and the session is recorded in one piece.
And after the session
The watch captures. It doesn't compare.
One session tells you where you were that day. It doesn't tell you whether you're improving, or which pillar is slipping while the others climb.
That's the ATmetrYX cockpit's job: every session sent adds to the previous ones, and what appears is a trajectory — one curve per pillar. It's also where you enter what the watch can't see: your loads, your reps, your ski distance. Two minutes after the session, on your phone, calmly.
The cockpit installs like an app on your home screen. An email, a code, and it's open.
In short
A watch captures the structure: durations, sequencing, heart rate. It doesn't capture the values: loads, reps, machine distances. Accept that split and you'll have usable data; refuse it and you'll lose competition time for nothing.
For the rest: wear it higher up the forearm through the lifts, use a strap if you want the best data, and install an app that knows the format — otherwise you'll get one 2.5-hour block you can't do anything with.