12-Week Program Architecture

Here is the block-by-block progression;

Phase 1: Base & Tissue Tolerance (Weeks 1-4)
Focus: Safely transitioning the body to 5-6 days of frequency. Emphasizing aerobic base and neuromuscular introduction to speed (strides).
Long Run: Progressing from 7 miles to 10 miles.
Key Session: "Cruising" Tempos (Zone 3) to build aerobic strength without heavy lactate accumulation.

Phase 2: Specificity & Threshold (Weeks 5-8)
Focus: Raising the lactate threshold. This is where the race pace feels easier.
Long Run: 10 miles up to 12 miles, introducing fast-finish long runs (running the last 2 miles at race pace).
Key Session: Mile repeats at Half Marathon Pace (HMP) with short active recoveries.

Phase 3: Peak Performance (Weeks 9-10)
Focus: Maximum sustainable volume and race-pace lock-in.
Long Run: Peaking at 13-14 miles (over-distance to make 13.1 feel mentally manageable).
Key Session: 2 x 3 Mile Tempo at HMP. Testing biomechanical breakdown under high fatigue.

Phase 4: Taper & Supercompensation (Weeks 11-12)
Focus: Shedding fatigue while maintaining fitness. Volume drops significantly, but intensity stays high in short bursts to keep the legs snappy.
Long Run: 8 miles, then Race Day!
Key Session: Short intervals (400s or 800s) to prime the neuromuscular system without causing structural damage.