The AI coach that lives on your iPhone and Watch — not in someone's cloud. Now on iPhone Duo
Arc builds you a real training plan across the sports you actually do — running, cycling, walking, swimming, and strength — then adapts it week to week based on how your body is responding. Unlike coaching apps that ship your data off to a server, Arc's AI coach runs privately on your device: offline, fast, and yours.
Train the way you actually train
Mix running, cycling, walking, swimming, and strength in one plan. Add or drop activities anytime and Arc folds them into your current block — no starting over.
Meet your coach — now on your wrist
Ask Arc anything: get a pre-session briefing, ask why today is easy, or check whether you're on track for your event — right from your Apple Watch. Answers are handled privately through Apple's on-device and Private Cloud Compute models. Show it a photo, too: snap a race elevation sign, a gym whiteboard, or a screenshot from another app, and Arc reads it and answers.
A plan that adapts — and explains itself
Arc watches your readiness, your training load, and how each session actually went, then adjusts the days ahead. Every suggestion comes with a "Why this?" breakdown showing the exact signals it weighed and which way each one pushed — no black box.
Because life happens
Injured, sick, traveling, or just need a break? Tell Arc from the Today screen and it reshapes your plan for you. Days off count as rest, not missed — and your event date never moves. When you're ready, ask Arc how to ease back in.
Training built around your body
• Cycle-aware readiness — if you track your cycle in Apple Health, Arc factors your phase into readiness and your weekly plan (read-only; nothing is ever written back).
• Daily check-ins — muscle soreness, chafing, and saddle soreness feed your readiness score, so run and ride niggles both count.
• Readiness at a glance — on your Lock Screen, in the Dynamic Island, and on your watch.
Serious analytics, made readable
See your Performance Management Chart — Fitness, Fatigue, and Form plotted together over time — so you can watch fitness build and freshness peak for your big day. Track your acute-to-chronic load balance in plain English before it turns into an overuse injury.
Event day, dialed in
Turn your goal time and course into an even-effort pacing plan that eases the climbs and lets you run — or ride — the descents. Arc even tells you whether your current fitness is on track for the goal. Got more than one event? Add your tune-up B and C races and Arc fits them into your build with a light taper and easy day around each.
Fits your world
• Log by swiping on Today, ask Siri, or tap a Control Center button
• Personal records, achievements, and gear-mileage tracking
• Pods — share progress and weekly challenges with friends
• Fully localized in English and Spanish
Arc Pro
Free to start. Arc Pro unlocks the AI coach, the Performance Management Chart, event pacing, injury rebuilds, and more.
Your AI endurance coach — prescriptive, adaptive, transparent, and private.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://largentlabs.com/arc/privacy.html
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