Pre's 30/40s
Continuous 200 m fast / 200 m float, about 3 miles
Workout type
Speed sessions for middle-distance runners: reps around mile and 1500 m effort, sharpening sets and descending ladders, with enough rest to run them fast. A race-quality butterfly set for swimmers sits here too.
Continuous 200 m fast / 200 m float, about 3 miles
10 × 400 m at mile effort, ~2 min recovery
4 sets: 400 fast · 90 s · 600 fast · 60 s · 200 very fast · 4–5 min
5 × 500 m at 1500 effort (75 s) · 800 jog · 5 × 200 faster (30 s)
4 × 800 m, ~6 min rest — two controlled, two near mile pace
6–8 × 800 m, surge the last 200, 2–3 min rest
Mile · 1200 · 1000 · 800 · 600 · 400 — each faster
2 sets of 1600 · 1200 · 800 · 400, faster down the set
3 × 100 butterfly descending, 200 easy between
Describe it and it's built for your Garmin — your coach can plan the weeks around it.