How Schedule Flexibility Works

How Pheidi adapts your plan when life gets in the way.

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Block a Day

When you block a date, Pheidi finds the nearest available day in the same week and moves the workout there. If no day is available, the workout is compressed out of the week with priority given to long runs and quality sessions over easy/recovery runs.

Swap Workouts

You can swap any two workouts within the same week. Pheidi validates the swap to prevent consecutive hard days — two quality or long-run sessions within a 1-day gap are flagged as problematic.

Schedule Reflow

When your available training days change (e.g., you switch from 5 to 4 days per week), Pheidi reflows all remaining weeks to fit the new schedule. Workouts are redistributed to new day slots, with compression applied when fewer days are available.

Compression priority: long run > quality workouts > easy/recovery runs. The least important workouts are dropped first when days shrink.

Taper Protection

Taper weeks are protected — volume increases from day blocking or reflow are not applied during taper to preserve race readiness.

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Research & evidence

Science behind this feature from pheidi.training.

• Running Training Plan: The Complete Guide Pillar hub linking 48+ deeper dives — start here for the full picture.
• Rescheduling Workouts: Rules How to shift runs without breaking the week.
• The FIRST Method: 3 Runs Per Week High-quality low-frequency training for time-constrained runners.
• Handling Missed Runs 10-day rule, make-up strategies, and when doubling up backfires.
• 300,000 Runners, Missed Training Patterns Strava data on how often runners actually miss training.

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See also

• How Vacation Scheduling Works What happens to your training plan when you schedule time off: date-range blocking, load redistribution, and graduated return to normal volume.
• How Load Redistribution Works What happens to the miles you remove from your plan, and how Pheidi safely reallocates load across future easy runs without breaching ACWR thresholds.
• How Plan Layers Work How Pheidi modifies your training plan non-destructively through overlay layers, so every change (vacation, injury, swap) can be undone without losing the original.