Meet Polarize — Audit your 80/20 training split, offline

Health And Fitness

Polarize

Audit your 80/20 training split, offline

What Polarize does

You think you train easy. Your data says otherwise.

Decades of endurance research point to the same pattern: the athletes who improve fastest spend roughly 80% of their weekly training minutes truly easy and about 20% genuinely hard, with almost nothing stranded in the moderate middle. Yet GPS studies of over 100,000 recreational runners show the average athlete logs something closer to a 50/50 split, spending 30 to 40% of their 'easy' runs above their actual easy ceiling. That sluggish, always-tired feeling has a name: gray-zone creep. Polarize is the tool that finally makes it visible.

Polarize is a training-intensity-distribution auditor for runners, cyclists, rowers, and anyone chasing aerobic fitness. Set up your personalized heart-rate or pace zones once, then log each session by minutes and intensity. Polarize stacks every session into a single, honest weekly bar: easy on one side, hard on the other, the moderate gray zone called out in between. One glance tells you whether this week actually hit the polarized target or quietly drifted into the threshold trap.

This is not a GPS tracker, a coaching subscription, or a social feed. It is a focused weekly auditor that does one thing incumbents bury under maps and badges: it computes your real intensity distribution and holds it up against the 80/20 model. No login. No straps to pair. No monthly fee. Everything runs offline on your phone, so your training history stays yours.

Whether you are base-building with a pyramidal block or sharpening into a polarized peak before race day, Polarize keeps you honest week after week. Stop guessing whether your easy days are easy enough. Start auditing.

• Personalized HR and pace zones from a quick guided setup (max HR, lactate-threshold, or pace-based) • One-tap session logging by minutes and zone, no GPS or sensors required • Weekly easy/hard distribution bar against the 80/20 polarized target • Gray-zone creep alerts when too much volume lands in the moderate middle • Choose your model: polarized, pyramidal, or threshold target distributions • Rolling 4-week and 12-week distribution trends to spot drift early • Streak and weekly-volume summary so consistency stays in view • 100% offline, no account, no subscription, no data leaves your device

A look inside

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What's inside

• Weekly distribution audit — Stacks every logged session into a single easy/hard bar for the week and overlays the chosen target line (default 80/20), so a glance shows whether the week was actually polarized.
• Personalized zone setup — A short guided flow builds HR or pace zones from max HR, lactate-threshold HR, or threshold pace, defining the easy ceiling and hard floor used to classify every session.
• Fast session logging — Log a workout by entering minutes and tapping the intensity zone; no GPS, sensors, or pairing. Sessions immediately roll into the weekly bar.
• Gray-zone creep alerts & trends — Flags weeks where too much volume lands in the moderate middle and charts 4-week and 12-week distribution trends to surface drift before it stalls progress.

Why we built it

Endurance athletes intend to train polarized (80% easy, 20% hard) but unknowingly let 'easy' runs drift into the moderate gray zone, and no simple offline tool computes their real weekly intensity distribution against the 80/20 target.

What makes it different

Polarize computes one thing the big apps bury: your weekly training-intensity distribution audited against an 80/20 / pyramidal / threshold target, with explicit gray-zone-creep flagging. Strava and Garmin Connect record sessions but never surface a clean easy/hard split or call out the middle zone; coaching apps like…

Who it's for

Anyone who wants honest tracking without a coach, a subscription, or a streak guilting them at 11pm.

In one line: Audit your 80/20 training split, offline

Try it

See the Audit your 80/20 training split, offline for the full feature list, the info table, and support links.

Use Polarize, found a bug, or have a feature request? Comments are open below — anonymous is fine.