Build and review an ultra race plan

Observed pacing is not an optimal prescription

In an observational analysis of 51 selected runners in one 24-hour track race, greater distance was associated with lower speed variability and fewer substantial speed reductions. The analysis used lap-average speed; it could not reliably separate stopping from slow movement. Selection, fitness and fatigue can affect both pacing and performance. The association does not show that forcing even speed improves an individual runner’s result.

Use this as a reason to examine how a race unfolded, not to copy a population-average curve. Flat-track speed variability does not provide a target for a mountain course. The planning choices below are editorial practice, not a validated pacing algorithm.

• The Impact of Sex and Performance Level on Pacing Behavior in a 24-h Ultramarathon (opens in a new tab) · Verification and limits

Aerobic decoupling and durability · Ultra training: specificity without multiplying mileage

Build a segment plan

Divide the route by terrain, navigation demands and resupply. For each segment write its purpose, expected elapsed-time range, effort cue, hiking option and checkpoint task. Include the organizer’s cutoffs and where the plan can be revised. A range is an estimate, not permission to ignore a cutoff. Rehearse the approach on comparable terrain rather than deriving every split from race distance alone.

Before the start, choose what would make you slow down or abandon a time goal. If an early split is quicker than planned, ask whether the terrain explains it and whether the effort remains familiar. Do not treat being behind schedule as a debt to repay on the next climb. Competitive position is one input; decide beforehand which surges fit your priorities and preparation.

Readiness check · All distances · 50K Race Protocol · 100K Race Protocol · 100-Mile Race Protocol · Multi-Day Race Protocol

Moving pace, stopped time and checkpoint splits

A 2025 observational analysis used results from six approximately 161-km races. Checkpoint arrival times describe elapsed segments, including time spent stopped; they do not isolate moving speed. The analysis included finishers, so its patterns cannot tell us which pacing choices would have prevented a withdrawal. Race and runner differences also limit comparison.

For your own review, distinguish time moving, time stopped and total elapsed time where your records allow it. Compare similar terrain and conditions. If a checkpoint is late because of a shoe repair, faster running is a different decision from improving the repair process. Record why a stop happened before classifying it as wasted time; a needed refill or assessment should not be removed just to improve a stopwatch total.

• Pacing and placing in 161-km ultramarathons: Effects of sex and age (opens in a new tab) · Verification and limits

Tools · Aerobic decoupling and durability

Choose a signal and a fallback

Choose a familiar primary effort cue from training, such as perceived effort, and use watch data as supporting context. Write down what the cue means in your own words on a runnable flat, a climb and a descent. A pace, heart-rate or power number should not automatically overrule footing, conditions or your ability to follow the plan.

When signals disagree, first check the situation and the measurement: terrain, weather, recent intake, fatigue and sensor behavior. Compare heart rate or pace with a similar rehearsed effort, not with an unrelated flat-road target. Treat grade-adjusted pace and running power as device-specific planning aids; this guide does not establish their accuracy on technical trails or a transferable race threshold. Decide how you will navigate and regulate effort if a device or battery fails.

Methods and assessments · Environment, navigation and race kit · Ultra fueling: a plan you can keep using · Hydration: access, thirst and overdrinking

A repeatable aid-station and crew sequence

Before race week, check current organizer rules for assistance, mandatory kit, drop bags, navigation and cutoffs. Assign crew roles and agree where support is actually confirmed. Pack drop bags for the relevant segment: label the location, separate essentials from optional items and rehearse access with tired hands. Carry what the rules and next segment require even when a supporter may be present.

At a post: assess your condition; state the next segment and its demands; refill and collect planned food; resolve kit tasks; confirm the route and departure readiness. Tell crew what changed, what you need now and what to check next. Use the canonical fueling, hydration, foot-care and sleep guidance for those decisions.

Write one fallback for a missed crew handover, unavailable food and failed lighting. Check what the official post can actually provide. If the fallback does not support the next segment, reassess with race staff before leaving. The purpose is reliable execution, not the shortest possible stop.

Ultra fueling: a plan you can keep using · Hydration: access, thirst and overdrinking · Foot care over long race days · Sleep and overnight ultras · Environment, navigation and race kit

What changes with distance and format?

50K: for a shorter, familiar event, emphasize controlled execution at the effort rehearsed for that terrain. Keep resupply and kit tasks proportionate; a mountainous or remote 50K still needs its own duration and logistics plan.

50 mile: revisit plans borrowed from a 50K. Check resupply gaps, how to maintain your rehearsed intake plan over the longer duration, the final section and whether your likely finish time changes lighting needs. Do not simply stretch each 50K split.

100K: plan repeated intake and checkpoint decisions across the full expected duration. Identify where terrain or leg fatigue could change the pace assumption; use the existing 100K race protocol to organize execution.

100 mile: if your expected schedule crosses a night, connect pacing with lighting, crew handovers and the sleep decision plan. Write down which goals can change as conditions evolve. Distance alone does not dictate a nap schedule.

Multi-day: distinguish a staged event with overnight recovery from continuous racing across several days. For stages, review the next start, food, feet, kit and sleep opportunity before choosing today’s effort. Continuous events need an ongoing overnight and resupply plan. These are planning modifiers, not five evidence-proven pacing formulas; duration, terrain, support and experience can matter more than the label.

50K: from marathon fitness to trail readiness · 50 mile: preserve options late in the race · 100K: use the protocol in context · 100 mile: plan for the hours after dark · Multi-day ultras: protect the next day

When the plan no longer fits

At the next appropriate decision point, name the mismatch: terrain, timing, intake, equipment or how you feel. Separate the goal from the immediate task. Choose a feasible next action, revise the next segment’s expectation and agree when to reassess. Change one manageable part of the plan where possible so the effect is easier to interpret.

A missed time goal does not require a faster next segment. Use current organizer cutoffs and available support to assess whether the revised plan is feasible. Prior investment and a competitor’s decision are not evidence that continuing is appropriate. Follow event instructions and the existing safety guidance; the late-race section in the linked race overview defines the boundary of this planning framework.

Ultra pacing and race execution · Mental performance playbook · Sleep and overnight ultras · 100-Mile Race Protocol

Review decisions before changing training

After the race, compare the intended segment plan with elapsed time, stops, intake, terrain and the decisions you remember. Keep observations separate from explanations: a late slowdown is an observation; insufficient fitness is only one possible explanation. Mark missing data and uncertain recollections.

Choose one change to rehearse before the next race, such as a simpler crew handover or a more realistic terrain estimate. Link a recurring late-run pattern to durability assessment and the training guide; use the recovery guide for return-to-training decisions. A race debrief is not a diagnosis, and one race does not validate a new training theory.

Aerobic decoupling and durability · Ultra training: specificity without multiplying mileage · Recovery when another start is coming

Apply this to your distance

50K: from marathon fitness to trail readiness · 50 mile: preserve options late in the race · 100K: use the protocol in context · 100 mile: plan for the hours after dark · Multi-day ultras: protect the next day

Educational content: health disclaimer