Peak Intervals vs PeakInterval

Peak Intervals guides two endurance workouts on Apple Watch: the Norwegian 4x4 to train your VO₂ max, and steady Zone 2 sessions to build your aerobic base. Your iPhone follows along live and shows how each session went. Guided workouts need Apple Watch and a Peak Intervals Pro subscription, with a 2-week free trial where available. History, Trends and the analysis of your Apple Health workouts are free. NORWEGIAN 4x4 • Four 4-minute intervals at 90–95% of your max heart rate, with 3-minute recoveries. • Live guidance keeps you in the zone: haptic cues on your wrist, and voice cues with headphones. • Afterwards, see whether you reached the zone quickly, stayed in it during every interval, held your pace or power from the first interval to the last, and how fast your heart rate came down in each recovery. ZONE 2 • Run, ride, row or walk on an incline, indoors or outdoors, with a guided warm-up and cool-down. • An alert tells you when you drift out of the zone, and a talk test at 15 minutes asks how the effort feels. • Afterwards, see how much of the session you spent in the zone, whether your heart rate crept up at the same effort (decoupling), and how your power or pace at Zone 2 heart rate compares with your last session of the same activity. ZONES THAT FIT YOU • Your max heart rate starts from an age estimate and goes up if a recent workout in Apple Health reached a higher heart rate. • Zone 2 uses your Apple Health heart rate zones on iOS 27, or your resting and max heart rate. • Your talk test answers help tune the zone: after three easy sessions the app offers to raise it, and when talking gets hard it offers to lower it. You decide. TRENDS AND HISTORY • Compare your last 3 sessions with the 3 before, with a clear verdict such as Improving or Stable. • See your VO₂ max and resting heart rate from Apple Health next to your training. • Every session in one place, including workouts from Apple Health. • Share a session as a story or post, with your own photo in the background. APPLE WATCH AND iPHONE Workouts start and record on Apple Watch. Your iPhone follows live, also on the Lock Screen and in the Dynamic Island. Apple Health Peak Intervals reads workout and heart rate data from Apple Health (HealthKit) to calculate your metrics and trends. You control what is shared at any time in iOS Settings. Subscriptions Peak Intervals offers an auto-renewing subscription with monthly and yearly plans, including a 2-week free trial where available. After the trial, an active subscription is required to start new workouts. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription in App Store account settings. Peak Intervals is not a medical device and does not provide medical advice. High-intensity exercise may not be appropriate for everyone. Consult a physician before beginning a new training program. Privacy Policy: https://peakintervals.app/privacy Terms of Use: https://peakintervals.app/terms

PeakInterval is your focused interval timer and training companion. Start with a simple timer, or build a routine with optional Peak Plus. No account. No ads. YOUR ORIGINAL TOOLS STAY FREE • Japanese walking, HIIT, Tabata, run/walk, sprints, focus blocks and mobility • Unlimited basic custom timers with Quick Build and individual interval editing • Spoken interval names, sound cues, countdown beeps and haptics • Lock Screen Live Activities and Dynamic Island • Apple Watch companion to start, pause, skip and stop the timer on your paired iPhone • Full local workout history, lifetime minutes and day streak GO FURTHER WITH PEAK PLUS • Four progressive programs: Walking Foundations, Run / Walk Journey, Bodyweight Basics and Mobility Reset • 66 program sessions across 4–8 week plans, with completion tracking • 24 additional interval workouts for walking, running, HIIT and mobility • Daily workout variations generated locally for your selected goal, level and time • A training calendar with optional local workout reminders • Weekly workout and minutes goals, 7- and 28-day trends, effort balance and milestone badges • Circuit Studio: named exercise circuits, EMOM, boxing rounds and pyramid intervals • Favorite Plus workouts, export and import timer files, and export history as CSV MOVE AT YOUR OWN PACE Choose gentle, steady or challenging intervals. Preview programs before subscribing, repeat a week when needed and leave room for recovery. Workout suggestions are general timing templates, not medical advice or individual coaching. PRIVATE BY DESIGN Your timers, training preferences, calendar and history stay on your device. Daily variations use local rules, not a remote AI service. You control exported files and optional notification permission. Apple handles subscription purchases. OPTIONAL SUBSCRIPTIONS Peak Plus is available as a monthly or annual auto-renewing subscription. Both plans unlock the same features while active. Prices and billing periods are shown in the app before purchase. Payment is charged to your Apple Account. Subscriptions renew automatically unless canceled before renewal. Manage or cancel in your Apple Account subscription settings. Restore Purchases is available in Settings and on the Peak Plus screen. All original free features remain available without a subscription. Privacy: https://oanarinaldi.com/peakintervalprivacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Requires iOS 17 or later. Apple Watch companion requires watchOS 10 or later and a reachable paired iPhone.