Polarised intensity distribution: roughly 75–80% of weekly volume at easy aerobic effort, 15–20% at quality (threshold, intervals, tempo), and 0–5% at race-pace. This split is the most-supported intensity distribution in the published endurance-training literature.
Quality sessions placed Tuesday and Thursday with full recovery between. Long session on Saturday (running / cycling) or Sunday brick (triathlon). Rest day Monday or Friday depending on your days-per-week.
Each session in the engine comes with a one-line 'why today' explanation. In the real adaptive plan, that rationale is anchored to your HRV, Training Status, and recent load — not the static template you see in this sample.