Below are answers to the most common questions about how Adaptive Training works. If you’re unsure why the system is behaving a certain way, this is a good place to start.

Adaptive Training adjusts in two key ways. First, it responds to changes in your Critical Power (CP). As your fitness improves, your CP will update, and the system will recalibrate your workouts to match your new fitness level. Second, it responds to your schedule. At the start of each new training phase, you can change the days you train and the structure of your week. If you add or remove a race from your plan, the entire training timeline automatically recalculates around your new goal.

Over time, the system also uses your RPE (Rate of Perceived Effort) reports after each run to check whether your CP is still accurate. If something seems off, it will flag it and prompt you to re-test.

The traditional Stryd Training Plans follow a fixed structure: the workouts, durations, and schedule are set in advance, and you follow them from start to finish. Adaptive Training is more flexible. It adjusts in real time based on your performance, your schedule changes, and your CP updates.

The most practical difference is that with Adaptive Training, you choose which days of the week you train, and you can change those days at the start of each new phase. You’re not locked into a preset schedule.

Every good training cycle is built on a foundation of easy running. Adaptive Training always starts with a lower-intensity block to ensure you’re ready for harder work later.

Where you start depends on your recent training history:

Both phases are intentional. The science behind endurance training consistently shows that most improvements happen at lower intensities, and that athletes who rush into hard training too early are more prone to injury and burnout.

If you start in the Foundation phase: it may take a few weeks of easy runs before the system introduces harder sessions. This is by design; the system is waiting for your body to build the consistency needed to handle workouts.

If you start in the Aerobic phase: you will begin seeing workouts within roughly your first ten runs.

In both cases, the system gradually increases intensity. You won’t go from all easy runs straight to hard intervals; there’s a progressive ramp-up.

When you add an Event A race to your Adaptive Training plan, the system recalculates your entire training timeline around that race date. This means your current phase, and how long you spend in each phase going forward will be adjusted so you peak at the right time.

For example, if you were in the middle of an Aerobic phase and add a race that is 12 weeks away, the system may shorten or extend certain phases to make sure you complete a proper build and taper before race day. This change is expected and necessary; the goal is to make sure your training is optimized for your race, not just your current week.

Yes, but the timing matters. You can adjust your training days and weekly structure at the start of each new training phase. When you transition into a new phase, the system will give you the opportunity to update your schedule.

Outside of phase transitions, you can always edit your Adaptive Training by selecting the Adaptive Training card in the app and choosing “Edit.” Keep in mind that mid-phase changes may affect how the current week’s workouts are scheduled.

Missing an occasional run within a week is normal, and the plan will continue without any intervention needed. However, if you miss several days in a row, you may want to use the Pause and Reactivate feature so the system can make an appropriate adjustment based on how long you’ve been away.

Here’s how the system responds to different lengths of inactivity when you reactivate:

Stryd compares your RPE (Rate of Perceived Effort) reports against your power data after each run. If your reported effort doesn’t match what your power profile suggests it should feel like at your current CP, the system flags a potential inaccuracy.

For example, if you report a run as “easy” (RPE 1–4) but your power data shows you spent a significant amount of time running at or above your Critical Power, that’s a signal that your CP may be set too low, making effort zones that should feel easy actually feel hard.

When this happens, you’ll be given three options:

For more details, see the support article: CP Accuracy Flow for Adaptive Training.

Event A is your primary goal race. It’s the race your entire training plan is built around. You should have one Event A race per training cycle, and the system will build a taper in the weeks before it so you arrive at the start line in peak condition.

Event B races are secondary races that help you gauge your fitness and race readiness in the lead-up to your Event A. They are not the focus of your training, so there’s no dedicated taper for them. Instead, the system will schedule easy runs for the 2 days before the race and 1 day after, then pick right back up in your normal training cycle.

Event C races are low-priority fun runs or “rust busters.” These are typically run at less than maximum effort and are treated as a normal training day by the system. They’re a good way to stay race-sharp without disrupting your training.

This is intentional and specific to how Event B races are handled by Adaptive Training. Because B races are not your primary goal, the system does not build a full taper around them. Instead, it makes a smaller adjustment: the 2 days immediately before your B race are automatically switched to easy runs to give your legs some freshness going in. The day after the race is also scheduled as an easy run for recovery.

If any of those days are already rest days in your plan, nothing changes; you keep the rest day. Only scheduled run days are affected.

After that recovery day, your Adaptive Training picks up exactly where it left off in your Event A training cycle.

No. The Stryd system only supports one active training plan at a time. If you are currently following a Stryd Training Plan, you will need to pause it before starting Adaptive Training.

To pause a Stryd Training Plan, follow the instructions in the support article: How to Use Stryd Training Plans.

The recommended window is 13–16 weeks before your race, particularly for half marathons and marathons. This gives the system enough time to take you through a complete build, including base phases, peak phases, and a proper taper.

Adaptive Training supports race-specific training for up to 24 weeks before your race. If you start more than 24 weeks out, the plan will run in maintenance mode until you are 24 weeks away, at which point it will automatically switch to race-specific training.

The system will allow you to start as close as 4 weeks before your race, though this is not recommended for longer distances like the marathon. A 4-week plan will be very condensed, essentially a build and a taper with no room for testing or recovery weeks.

Your Peak Weekly Duration is the maximum number of minutes you will run in a single week during your training cycle. You select this during setup, and it represents the ceiling of your training volume. Most weeks will be shorter as the system builds gradually toward this peak.

The system distributes your peak duration across the number of training days you selected. As you move through phases, the weekly volume increases and decreases according to the demands of each phase.

You can adjust your training days at the start of each phase, but the peak duration you selected during setup remains the reference point for your highest-volume weeks.