Ultra-Distance: Multi-Day for Amateurs
Multi-day ultra is won by how cheaply you hold a sub-threshold pace for hours — deep into fatigue, fueling the whole way — not by peak power. This collection takes pro methodology and filters it through the ultra-endurance science base AND through what actually works for people with jobs and families. You are not a pro, and you shouldn't train like one. For an amateur with a full-time job, hours are capped by recovery, not ambition — and in 600 km racers, three months of logged volume did not track race speed while longer individual rides did. Build the long ride, keep the quality short, and string the weeks together.
The assistant adapts these sessions to your event date, days and fitness — then drops the whole block on your calendar. One conversation, no blank calendar.
Fat oxidation / FatMax
Long easy riding raises mitochondrial content and is cheap to recover from — exactly the volume an amateur can do. Higher fat use as the decisive ultra adaptation is plausible, not measured.
Durability
Holding power without your thresholds collapsing after hours. What builds it is thinly studied: long rides with hard work late in them, consistent volume over years and heavy lifting are the candidates.
Threshold power
You ride an ultra far below your fresh threshold, but a higher threshold still means more speed at the same effort. Built with two short quality sessions a week.
Gut / fueling tolerance
Absorbing 60–90 g carbs/hour is trainable — and in one 1,230 km event intake fell after halfway and 12 of 14 riders ate less than they burned. Rehearsed on every long ride — it costs zero extra hours.
- —~80% easy / 20% hard. Keep the easy days out of the middle zone.
- —Two quality sessions per week, never more; hard–easy–hard–easy, and protect the easy days as genuinely easy. At these hours a third hard day rarely repays its recovery cost (coaching practice).
- —One weekend long ride is the engine of the week — FatMax pace, full fueling practice. The second weekend day stays easy or off.
- —Back-to-back long days are a periodic block (every 2–3 weeks in a build), not a weekly habit — and never back-to-back intensity mid-week.
- —Long-ride length is 2–4 hr, up to 6 at peak — or target ~1500+ kJ rather than chasing hours. Late in a long ride power drifts down; that drift is durability training.
- —No flat zones: the FatMax and easy rides undulate — power ripples within Z2 plus cadence floats and pushes, and the long ride adds 15-second micro-surges (in one acute study, shorter 4–7-second bursts left fat use and heart rate where steady easy riding put them; 15-second ones were not tested). What drives the aerobic adaptation is total time in the zone, not whether it's one block — and real riding is intermittent anyway. Fuel 80–100 g carbs/hour, which slows part of the late drift in power.
- —Still keep one genuinely long ride: the Durability Finisher stays continuous and goes late, because the drift of your sustainable power accelerates after about two hours of sustained work, so only a long ride shows it (whether it trains durability better than intervals is untested).
- —Before a hot event, run a 1–2 week heat block (session 8): easy riding in extra kit so heat, not power, is the stimulus — a practical alternative to altitude.
- —Periodize: base (sessions 1, 6, 7 + one of 3/4 midweek, ~80% easy) → build (two quality midweek, rotating 3/4/5, + Saturday long; swap in the Durability Finisher every 2–3 wk) → race-specific (lengthen the Saturday ride toward your event's daily distance, add an occasional back-to-back Sunday, then taper).
- —Consistency over heroics — steady weeks you can repeat beat a big week you cannot (coaching practice, not a tested rule).
The sessions
Session formats drawn from documented pro practice (UAE, Abrahamsen, Simmons) and time-crunched coaching literature (CTS, Seiler's intensity-distribution research, RCA), retained only where they map onto peer-reviewed ultra determinants. Cross-checked against the Blocks knowledge base: heat adaptation has training evidence, carbohydrate's partial protection of late-ride power has lab evidence, and the micro-surges rest on one acute study whose fibre-recruitment rationale is inference. Percentages are training-zone guides — set against your own FTP; on the longest rides ride by feel/HR. A training framework, not a personalized plan.