Time in zone: part of it wasn't being counted, mostly with Bluetooth heart rate monitors. Now every second of each interval counts, and your past sessions are updated too, so your numbers may go up a little. Trends: a session that shows 40% in zone now counts toward your trends, and when most of your sessions miss the zone, Trends suggests checking your max heart rate in Settings. Workouts: no more zone cues during warmup and cooldown, and the cooldown screen shows just your heart rate. On Home, insights now show their full text. New first-run Home. Before your first workout, Home shows what is left to set up (Apple Health, heart rate zones, Apple Watch or a Bluetooth heart rate monitor), a preview of your first 4x4 or Zone 2 session with your own heart rate zone and its blocks, an example of what you see after each session, and a shortcut to import a past 4x4 or Zone 2 workout from Apple Health. It works on both the 4x4 and Zone 2 tabs. • Start screen: when no heart rate source is found, it explains how to connect Apple Watch or a Bluetooth heart rate monitor and lets you check again. It also tells you when Peak Intervals still needs to be installed on your paired Apple Watch. • Setup: if you don't allow Apple Health, setup moves straight on and explains that your zones start from your age. Choosing your birth year is now the main button on that step. • Settings: a new Apple Health row shows whether Peak Intervals is connected and, if not, where to turn it on. Fix: on Home, tapping or swiping the insights card now moves one insight at a time, and it no longer jumps back to the first one. Fix: during 4x4 recoveries, iPhone now shows your recovery target (50–70% of max heart rate) and whether you're in it, just like Apple Watch. Fix: voice cues in your headphones now play when iPhone is locked or Peak Intervals is in the background.

New first-run Home. Before your first workout, Home shows what is left to set up (Apple Health, heart rate zones, Apple Watch or a Bluetooth heart rate monitor), a preview of your first 4x4 or Zone 2 session with your own heart rate zone and its blocks, an example of what you see after each session, and a shortcut to import a past 4x4 or Zone 2 workout from Apple Health. It works on both the 4x4 and Zone 2 tabs. • Start screen: when no heart rate source is found, it explains how to connect Apple Watch or a Bluetooth heart rate monitor and lets you check again. It also tells you when Peak Intervals still needs to be installed on your paired Apple Watch. • Setup: if you don't allow Apple Health, setup moves straight on and explains that your zones start from your age. Choosing your birth year is now the main button on that step. • Settings: a new Apple Health row shows whether Peak Intervals is connected and, if not, where to turn it on. Fix: on Home, tapping or swiping the insights card now moves one insight at a time, and it no longer jumps back to the first one. Fix: during 4x4 recoveries, iPhone now shows your recovery target (50–70% of max heart rate) and whether you're in it, just like Apple Watch. Fix: voice cues in your headphones now play when iPhone is locked or Peak Intervals is in the background.

Train with Apple Watch or a Bluetooth heart rate monitor. No Apple Watch? Pair your heart rate monitor in iOS Settings, and your 4x4 and Zone 2 workouts record on your iPhone, with live zones, voice cues in your headphones, the Lock Screen and the Dynamic Island. • One start screen: choose where your heart rate comes from, and set a default in Settings. • Norwegian 4x4 and Zone 2 both work with either. • History shows which device measured each session. • Apple Watch keeps its haptic cues on your wrist. New: bring in workouts from other apps. Pick one from Apple Health, say whether it was a 4x4 or Zone 2, and answer a few questions about its warmup, intervals and recoveries. You see your answers lined up with your heart rate, and the workout lands in History tagged Imported. A 4x4 with a different structure is kept in History but doesn't count toward Trends.

A max heart rate that fits you: it starts from your age (your birthday in Apple Health, or a birth year you add once if Health has none) and adapts as your workouts measure it, within what's realistic for your age. Apple Watch now waits for it from iPhone before your first workout, so your targets are personal from the very first interval. • A second look at high readings: when a 4x4 peaks well above what's typical for your age, Home asks whether to update your maximum heart rate before using it. A real all-out effort counts; a reading from a wrist sensor that locked onto your running cadence doesn't.

New: Trophies. Tap the trophy button on Home, top right; a dot shows when something is new. The first time, a short intro counts through your workout history and every trophy you already earned pops in. • Milestones: your 1st, 10th, 25th, 50th and 100th 4x4. • Ways to train: your first, 10th and 25th 4x4 running, cycling and rowing, plus All-rounder for all three. • Distance in intervals: a marathon run, the Channel rowed (34 km) and 100 km ridden, added up inside your 4x4 intervals. • Consistency: 4 and 12 weeks in a row. • Training quality: Locked in (all four intervals at 90–95% of max heart rate) and Balanced week (a 4x4 and a Zone 2 in one week). • Zone 2 base: your first Zone 2, then 10, 25 and 50, and the Steady hour. Turn a medal over to see the date you earned it, and share any trophy as a story or post card. Trophies are personal: no leaderboards. Free for everyone. • Apple Watch complication: this week's sessions on every face, including the corner one; the rectangular style adds "Last 4x4: 72%". A session you just recorded shows at once, and it rises in the Smart Stack after 2+ days without training. • Start faster: the Action button and Siri start a 4x4 or Zone 2 ("Start Zone 2 in Peak Intervals"); Double Tap pauses, resumes, starts your first listed workout, or closes the summary; a new Control Center control shows how to start on Apple Watch. • Apple Watch accessibility: text follows your watch's text size; VoiceOver reads heart rate with zone status and timers and announces phase and zone changes; the zone label adds ↑ ↓ beside the color; Reduce Motion is respected. • iPhone: Liquid Glass buttons, a tab bar that shrinks on scroll, and a bar above the tabs with phase and heart rate during a Watch workout (iOS 26.1+). Larger text no longer cuts off the 4x4/Zone 2 switch or Home tips.

New: Zone 2 on Apple Watch. Build your aerobic base with steady sessions and push your VO₂ max with the Norwegian 4x4, both guided on your wrist. • Widgets: see your training week and your last 4x4 on the Home Screen and Lock Screen. • Siri: ask "How's my week in Peak Intervals?" or "Show my last 4x4 in Peak Intervals."

Zone 2 is here. Build your aerobic base alongside your 4x4, with Apple Watch guiding you. ZONE 2 • Run, ride, row or walk on an incline in your Zone 2, indoors or outdoors, with a guided warm-up and cool-down. • Apple Watch lets you know when you drift out of the zone, and a talk test at 15 minutes checks how the effort feels. • Your zone comes from your Apple Health heart rate zones on iOS 27, or from your resting and max heart rate. When sessions feel easy, the app suggests raising it. • After each session: time in zone with a clear verdict, heart rate with power or pace, decoupling, and your power or pace at Zone 2 heart rate compared with your last session of the same activity. • Heart rate sensor glitches are filtered out of your numbers. • iPhone follows Zone 2 workouts live, and the Live Activity turns blue. HOME, TRENDS AND HISTORY • Switch between 4x4 and Zone 2 on Home, Trends and History. • Your fitness: VO₂ max and resting heart rate from Apple Health, side by side on Home. • Zone 2 Trends: decoupling, time in zone, resting heart rate and Zone 2 minutes per week. The 4x4 view now shows your Apple Health cards too. APPLE WATCH • A new start screen: pick 4x4 or Zone 2 and change the options right on your wrist. • A 3-2-1 countdown before every workout. • End a 4x4 during the warm-up and choose whether to save it. • Fixes an error message that could appear right after you end a workout. ALSO NEW • A redesigned onboarding that builds your heart rate zones from Apple Health, including your max heart rate from your hardest recent workout. • Share any session as a story or a post, with your own photo in the background. • Settings now explain how your max heart rate is set.

Zone 2 is here. Build your aerobic base alongside your 4x4, with Apple Watch guiding you. ZONE 2 • Run, ride, row or walk on an incline in your Zone 2, indoors or outdoors, with a guided warm-up and cool-down. • Apple Watch lets you know when you drift out of the zone, and a talk test at 15 minutes checks how the effort feels. • Your zone comes from your Apple Health heart rate zones on iOS 27, or from your resting and max heart rate. When sessions feel easy, the app suggests raising it. • After each session: time in zone with a clear verdict, heart rate with power or pace, decoupling, and your power or pace at Zone 2 heart rate compared with your last session of the same activity. • Heart rate sensor glitches are filtered out of your numbers. • iPhone follows Zone 2 workouts live, and the Live Activity turns blue. HOME, TRENDS AND HISTORY • Switch between 4x4 and Zone 2 on Home, Trends and History. • Your fitness: VO₂ max and resting heart rate from Apple Health, side by side on Home. • Zone 2 Trends: decoupling, time in zone, resting heart rate and Zone 2 minutes per week. The 4x4 view now shows your Apple Health cards too. APPLE WATCH • A new start screen: pick 4x4 or Zone 2 and change the options right on your wrist. • A 3-2-1 countdown before every workout. • End a 4x4 during the warm-up and choose whether to save it. ALSO NEW • A redesigned onboarding that builds your heart rate zones from Apple Health, including your max heart rate from your hardest recent workout. • Share any session as a story or a post, with your own photo in the background. • Settings now explain how your max heart rate is set.

A new design, and ready for iOS 27 and watchOS 27. NEW DESIGN • Home, Session Detail, History and Trends now fit on one screen, with the same look on iPhone and Apple Watch. • Home: your last session at a glance, with time in zone for each interval, one insight at a time, and your week. • Session Detail: heart rate with the 90–95% band, the zone split of every interval, your strongest and least efficient rep, and each recovery. • Trends: last 3 sessions vs the 3 before, plus time in zone for every session, now also for All time. • History: your mix of activities and indoor vs outdoor sessions. iOS 27 AND watchOS 27 • On watchOS 27, each workout sets the 4x4 heart-rate zones, so Health and Fitness show your time in each band. • Follow your Apple Watch workout on the Lock Screen and in the Dynamic Island. • Start a 4x4 with the Action button on Apple Watch Ultra, and open the app from the new watch face complication. WORKOUTS • Workouts start and record on Apple Watch. iPhone follows live and shows the saved session. • Live data on iPhone reconnects if the connection drops mid-workout. FIXES • Distance no longer adds iPhone steps on top of Apple Watch data. Past sessions are recalculated. • Your HRmax and indoor/outdoor settings now reach Apple Watch reliably. • Warmup data is kept if the Watch app restarts during a workout. • Voice cues no longer leave your music quieter. • Trend changes now match the numbers shown, with time in zone in percentage points. • The Live Activity ends when the workout ends. • Better Dynamic Type and VoiceOver support, including audio graphs for charts.

Performance improvements and bug fixes.

• Redesigned onboarding — try the app right away, no account required • Full localization: German, Spanish, French, Italian, and Portuguese • Fixed mixed-language UI by following your per-app language setting • Improved Trends and workout metrics • Bug fixes and stability improvements

just bugfixing

New Trends tab to track your progress over time, plus improved treadmill run accuracy by preventing rare distance spikes from affecting interval results.

We’ve improved onboarding to make Peak Intervals easier to get started with, including clearer guidance for Apple Watch setup, a better explanation of workout analytics and progress tracking, and a smoother path for athletes using iPhone only. This update also improves sign-in and account creation with better email/password handling and smarter password autofill support. On Apple Watch, live workout guidance is now more reliable, with clearer heart rate target feedback and improved syncing of workout state and metrics.

- Refined the latest workout summary with cleaner stats, better alignment, and clearer interval insights. - Improved Apple Watch workout start reliability. - This update makes subscription sync between iPhone and Apple Watch much clearer and more reliable. If the watch can’t verify Pro access right away, you’ll now see guided recovery steps instead of a generic error.

Bugfixes and enhancements

This update makes Peak Intervals clearer, more useful, and easier to read after every 4x4 session: A redesigned Home screen that keeps your latest workout and execution analysis together in one place Clearer Session Detail views with a better workout overview, stronger interval breakdowns, and cleaner analysis A refreshed Trends experience with simpler comparisons between your latest sessions and earlier ones Improved explanations for metrics like time in zone, repeatability, recovery, and heart-rate trends New info buttons across the app so you can quickly understand how each metric is calculated A cleaner, more analytics-focused presentation throughout the app Bug Fixes Improved workout syncing between Apple Watch and iPhone Fixed issues where completed workouts could appear more than once in history Improved workout end handling so sessions close more reliably Fixed issues with audio cues and playback behavior during workouts Improved stability when starting workouts from Apple Watch

Bug fixes and performance improvements.

Bug fixes and performance improvements.