Getting Started With Half Marathon Training on Apple Fitness
The Apple Watch doesn't have a native "half marathon program" button you can tap, so the actual workflow involves the Fitness+ app on iPhone or iPad. Open the Fitness app, go to Fitness+, and you'll find curated training plans that include 8- and 12-week half marathon options. They cost the same as any Fitness+ subscription—about $10 a month if you're paying individually. The plans are led by trainers who walk you through each run, show you target heart rate zones, and tell you when to speed up or slow down based on the day's workout. Here's the thing most people miss: these are guided video/audio sessions, not automatically synced training calendars. The workouts show up in your Fitness+ library, but they don't appear in the Apple Watch Training Center the way Nike Run Club or Strava structured workouts do. You have to find and start each session manually from the app. I found myself opening my iPhone mid-run once to find the next workout because I assumed it would auto-advance on the watch. It doesn't. Plan for that friction.
Apple Fitness Half Marathon Training: What the Program Actually Looks Like
The half marathon training plan from Fitness+ typically runs 8 to 12 weeks depending on the track you pick. You'll see long runs scheduled once a week, tempo runs another day, and rest or cross-training on the remaining days. The total weekly mileage builds gradually—starting around 15 to 20 miles per week and peaking at roughly 30 to 35 miles in the final two weeks before the taper. If you're not already running consistently, jumping straight into this structure without a base will get you injured within three weeks. That's not a warning, it's just the math of how these programs are written. The workouts include heart rate zone targets that are displayed live on your wrist during the run. Your watch pulls this data from the optical heart rate sensor, and the trainer's cues are timed around those zones. Zone 2 runs feel conversational. Zone 4 tempo runs feel uncomfortable. The plan tells you where you should be, and your watch tells you whether you're there. The problem is the heart rate lag—especially on older Watch Series 6 and earlier models. During interval workouts, your heart rate reading can trail your actual effort by 30 to 60 seconds. I learned this the hard way during a 10K tempo run when the watch kept telling me I was still in Zone 2 while I was clearly gasping for air. Switching to a chest strap heart rate monitor fixed the delay almost immediately. The Polar H10 pairs easily and gives you near real-time readings. Another detail that matters: the long runs in the plan are usually 90 to 120 minutes. Your Apple Watch will track them fine, but the battery life concern is real if you're doing this on Watch OS without lowering brightness and turning off always-on display. On a Series 8 with always-on disabled, I get about 10 to 11 hours of mixed GPS and heart rate tracking before I hit 20 percent. A 2.5-hour long run on a Series 3 or older will eat through that battery much faster. If you're planning a 20-miler, you might want to drop your phone in your pocket with GPS active and let the watch handle heart rate only, or plan your long runs on days when you won't need the watch for anything else.
Workarounds for the Stuff Apple Doesn't Handle Well
Here's a specific issue I ran into that isn't discussed anywhere in the Apple documentation. When you complete a Fitness+ half marathon training run, the workout data shows up in the Apple Health app under "Indoor Run" or "Outdoor Run" depending on whether GPS was locked. But if you started the workout on your iPhone in the Fitness+ app and wore your watch, the data sometimes splits into two separate entries instead of merging into one. This happens more often than you'd think, and it skews your weekly mileage totals. I was about 3 miles short on a Sunday because the morning Easy Run and the evening recovery jog each created two entries instead of one. The workaround is straightforward: after every run, open the Fitness app on your iPhone, go to the summary for that workout, and manually merge duplicate entries by selecting both and choosing "Combine Workouts." It adds maybe 30 seconds to your post-run routine and prevents the numbers from drifting further apart over a multi-week plan. Do this weekly. Your monthly volume reports will stay accurate. There's also the issue of elevation data. The half marathon training long runs include significant hill work in certain plans, and the Apple Watch's barometric altimeter is generally reliable but can be thrown off by sudden weather pressure changes. If you're training in the Pacific Northwest or anywhere with rapidly shifting pressure, your elevation gain numbers might be 5 to 10 percent off compared to a known reference. I verified this against a Garmin Edge I had sitting around—the Watch consistently reported slightly less elevation on the same route. It doesn't ruin the training, but if you're using elevation gain to calibrate your effort perception, keep that variance in mind.
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What the Program Leaves Out
The Fitness+ half marathon training plans don't include strength work, mobility routines, or recovery protocols beyond the rest days. You're expected to add those yourself. I added a basic lower-body strength session twice a week using separate resistance bands and it made a noticeable difference by week 6. Without it, my hip flexors started tightening during the longer runs and my pace dropped off predictably after mile 16. The plan assumes you'll fill in those gaps, which is fair but easy to overlook when you're excited about the running portions. Another honest limitation: the training plans don't adjust for your current fitness level. The same Week 1 schedule is given to everyone regardless of whether you're coming off a previous half marathon or haven't run more than three miles in six months. If you're a beginner, consider spending two weeks doing the first week's workouts at a reduced pace before committing to the full progression. The trainers mention this possibility but don't build in a modified track for newcomers. You can also split the 8-week plan across 10 weeks manually by repeating the hardest week once—that's a common workaround I saw in the Fitness+ community forums.
Setting It Up So It Actually Works
Before you start the plan, make sure your Apple Watch is set to use your max heart rate correctly. Go to the Health app on your iPhone, scroll to Heart, then set Your Max Heart Rate to something close to 220 minus your age. If you don't do this, the heart rate zone calculations in the training sessions will be shifted and the pace targets won't match what you're actually capable of. This one setting affects every training load percentage the program assigns you. I had my max heart rate set to the default value for years and realized during Week 3 of a training plan that my Zone 4 thresholds were completely wrong. Adjusting it brought my tempo run paces into alignment within two weeks. If you want downloadable structured workouts instead of relying solely on Fitness+ video sessions, you can export your training calendar using the Health app and import it into third-party apps like TrainingPeaks or Final Surge for more granular pacing control. Apple doesn't offer native TCE or FIT file exports for Fitness+ workouts directly, but you can use a workaround through HealthKit data sharing if you're technical enough to set it up. Most people just stick with the in-app guidance and accept the limitations.
