Polarize

About this app

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