Why plan weekly mileage changes?#
Large changes in volume can feel manageable aerobically while still adding unfamiliar musculoskeletal load. A gradual template gives you time to notice how the added distance affects fatigue, soreness, and training consistency.
The 10% Rule is a popular coaching heuristic, not a universal safety threshold. Some runners need smaller changes, while experienced runners may use a different periodized plan.
Our calculator turns a current baseline and target mileage into a step-by-step template with optional Deload (Recovery) Weeks. It is not an individualized coaching or injury-prevention guarantee.
The anatomy of the generated template#
A training plan does not need to rise every week. Optional recovery weeks create room to reduce accumulated fatigue:
- 3 Weeks Progression (10% Increase): Gradually increase mileage for 3 consecutive weeks to stimulate physiological adaptation.
- 1 Deload Week (20-25% Reduction): Every 4th week, reduce your volume to allow muscle repair, glycogen replenishment, and mental reset.
- Step-up Baseline: After the deload week, resume training at the mileage level achieved in Week 3.
Frequently Asked Questions#
Q: Can I increase my mileage by more than 10% if I feel good?
A: Feeling good is useful information, but it does not make 10% a safety boundary. Consider training history, intensity, terrain, recovery, and any persistent discomfort before adding more volume.
Q: What should I do during a Deload (Recovery) Week?
A: The calculator uses a 20% reduction by default. Adjust the amount and frequency around your existing plan rather than treating one percentage or heart-rate zone as mandatory.
Q: How does Apex Run help me review training changes?
A: Apex Run compares recent training load with your longer-term Apple Health history and surfaces changes worth reviewing. These signals do not diagnose or prevent overtraining.