Run — intervals
5 × 1000 m — 5:23
- Warm up: 10 min very slow jog (the jog to the park IS this), then 4 relaxed 15-sec bursts
- Run 1000 m in ~5:23 — hard but controlled; end each rep feeling you had 2 more in you
- Rep 1 AT 5:23, never under it — every second banked early gets paid back double late
- Recover 2½ min jog, then go again — 5 reps total, then 5 min slow jog home
- Missing the times? Do fewer reps. Never run them slower — the pace IS the workout