Quick Answer
The shorter and more intense the race, the longer and more structured the warm-up. A 5K demands 20–30 minutes of preparation. A marathon needs only 5–10 minutes. Every warm-up should follow the same three-phase structure: easy jog → dynamic drills → strides. The strides — short progressive accelerations to race pace — are the most important and most commonly skipped element. Skip the static stretching before the race; save it for afterwards.
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Why a Proper Warm-Up Matters
The performance case for warming up is well-established and operates through several simultaneous mechanisms. Understanding them makes it easier to see why cutting the warm-up short consistently produces worse race results.
Raises baseline VO2. The aerobic system takes time to reach its operational capacity. Starting a race cold means the body relies more heavily on anaerobic energy sources to bridge the gap — accumulating lactic acid in the first kilometre that takes several minutes to clear. A proper warm-up, with intensity peaking around 65–70% of VO2 max, pre-loads the aerobic system so it’s operating efficiently from the first step. A 2009 study in the Journal of Science and Medicine in Sport confirmed that warming up measurably reduced athletes’ anaerobic energy contribution in early-race effort — meaning they spent less time in oxygen debt.
Increases muscle temperature. Warm muscle tissue contracts faster, generates more force, and absorbs impact more efficiently than cold tissue. Muscle temperature affects enzyme reaction rates, the speed of nerve impulse conduction, and the viscosity of synovial fluid in the joints. Each degree of muscle temperature increase improves contraction speed and metabolic efficiency. Cold muscle is also less resilient: research consistently finds injury risk is higher during the first minutes of a cold-start run, particularly for hamstring strains and Achilles tendon irritation. Our guide on breathing techniques for runners covers how warm-up intensity affects the respiratory system’s readiness to deliver oxygen efficiently.
Neuromuscular priming. Fast, coordinated movement requires established neural pathways between the brain and the motor units in the working muscles. Cold neural pathways fire more slowly, recruit fewer fibres simultaneously, and produce less coordinated movement. Dynamic drills and strides train these pathways back to their operational state before the race starts — effectively rehearsing the movement patterns at increasing intensity so they’re reliable when called upon at race effort. A 2012 review in BMC Medicine found that neuromuscular warm-up strategies significantly reduced lower extremity injury risk in runners and athletes.
Mental preparation. Warm-up is also a ritual that reduces anxiety and improves focus. Following a familiar routine before a race anchors attention on the known — what you’re doing in this moment — rather than on the unknown outcome of the race. This is not trivial; race anxiety produces cortisol and adrenaline that can cause runners to go out too hard. A structured warm-up creates the physiological and psychological readiness for controlled execution of a race plan.
The Three-Phase Warm-Up Structure
Every running warm-up, regardless of distance or level, should follow the same three-phase progression. The duration of each phase scales with race distance and intensity, but the sequence is always the same: easy jog → dynamic drills → strides.
Phase 1: Easy Jog
The jog establishes blood flow, raises core and muscle temperature, and gently elevates the heart rate toward the aerobic working zone. Pace should be genuinely easy — conversational, comfortable, noticeably slower than your normal easy running pace. Running too hard during the warm-up jog creates fatigue that affects the quality of the subsequent drills and strides, and in races, unnecessarily depletes glycogen before you’ve even started.
The warm-up jog should feel almost like you’re going too slowly. That’s correct. You’re not training here — you’re priming. Our guide on zone 2 running pace covers what genuinely easy effort looks and feels like, which is the same zone the warm-up jog should sit in.
Phase 2: Dynamic Drills
Dynamic drills improve active range of motion, activate the specific muscle groups used in running, and reinforce movement patterns before high-intensity effort. They replace static stretching (which reduces power output when done before a race) with movement that produces the same flexibility benefits without the performance cost. Research shows dynamic stretching improves hamstring range of motion and reduces passive stiffness — both relevant to running efficiency and injury prevention.
The essential running drills for most athletes:
Leg swings (front-to-back): Stand on one leg, swing the other leg forward and back through its full range of motion. 10–15 per leg. Progresses hip flexor and hamstring flexibility dynamically.
Leg swings (lateral): Same setup, swing the leg across the body and out to the side. 10–15 per leg. Activates hip abductors and glute medius — important for running stability.
High knees: Running in place or over 20 metres, drive each knee to hip height with a quick, active ground contact. 20–30 steps. Activates hip flexors, primes the foot-strike pattern.
A-skips: Skip with an exaggerated knee drive, landing on the ball of the foot. 20m down, 20m back. Develops cadence rhythm and reinforces the running mechanics used in faster pacing. Our running form guide covers how drills like A-skips improve stride mechanics over time.
Butt kicks: Flick the heel toward the glute on each stride. 20–30 steps. Activates the hamstrings and reinforces the recovery phase of the running stride.
Hip circles: Hands on hips, make large slow circles with the hips — both directions. 10 each. Lubricates the hip joint and activates the stabilisers that prevent lateral sway during running.
Walking lunges: 10 slow, controlled walking lunges. Activates glutes, hip flexors, and quads through a full range of motion. Particularly valuable before longer races.
Phase 3: Strides
Strides are the most important and most frequently omitted part of the running warm-up. A stride is a short progressive acceleration — typically 20 seconds — that builds from easy to race pace (or slightly faster) over the duration of the effort. Three to five strides, with 60–90 second easy jogging or walking recovery between each, are enough to prime the neuromuscular system for high-intensity effort.
The physiological effect of strides is specific: they activate fast-twitch muscle fibres that the easy jog and drills don’t fully engage, they train the body to reach race-pace oxygen consumption before the gun fires, and they confirm that the legs feel responsive and coordinated. After properly executed strides, the first minute of a 5K or 10K should feel achievable rather than shocking. Without strides, that first minute is often where the physiological debt of a cold start is paid. Our guide on interval running and speed development covers why this neuromuscular priming effect matters for performance.
How to execute strides: In a clear stretch of road or track, start at easy jog pace and gradually accelerate over 20 seconds to approximately race pace or 5K effort. The last 3–5 seconds should be genuinely fast — not a sprint, but a controlled, quick effort. Do not slow suddenly; decelerate gradually over 10–20 metres after the effort. Walk or jog easily for 60–90 seconds. The final stride should finish 5–8 minutes before race start — enough time for a brief recovery, a final toilet stop if needed, and moving gently to the start line without going cold again.
Warm-Up by Race Distance
| Distance | Easy jog | Drills | Strides | Total | Key priority |
|---|---|---|---|---|---|
| 5K | 10–15 min | 6–8 min | 4–5 × 20 sec | 22–30 min | Strides to race pace — you need to be firing from the gun |
| 10K | 10–12 min | 5–6 min | 3–4 × 20 sec | 18–23 min | Progressive strides; drills more important than jog length |
| Half Marathon | 8–10 min | 5 min | 3 × 20 sec | 14–18 min | Easy jog and mobility; strides to confirm legs are ready |
| Marathon | 5–8 min | 4–5 min | None or 2 easy | 9–14 min | Energy conservation — let the first 3km be your warm-up |
| Ultra Marathon | None needed | 5 min mobility | None | 5 min | Joint mobility only; the run itself warms you up |
| Intervals / Track | 12–15 min | 6–8 min | 4–5 × 20 sec | 22–28 min | Same as 5K — fast-twitch priming is critical before the first rep |
| Tempo / Threshold | 10–12 min | 5 min | 3 × 20 sec | 17–22 min | Bring HR to threshold zone gradually; strides confirm readiness |
| Easy / Recovery Run | 3–5 min walk | Optional | None | 3–5 min | The run itself is the warm-up — just start slowly |
Warm-Up Adjustments for Conditions
Cold Weather (below 10°C / 50°F)
Cold ambient temperature slows muscle warming significantly — add 3–5 minutes to the easy jog phase and an additional drill set. Wear a layer during the warm-up jog that you can discard before the race. The risk of cold-start injuries (hamstring, Achilles, hip flexor) is substantially higher in cold conditions. Don’t use cold weather as a reason to skip the warm-up — it’s the exact opposite scenario where it’s most needed.
Warm Weather (above 22°C / 72°F)
In warm conditions, muscle temperature rises faster and the easy jog phase can be shorter (subtract 2–3 minutes). The risk shifts from under-warming to overheating and glycogen depletion from a too-long or too-intense warm-up. Keep the jog pace very easy and the drills gentle. In extreme heat (above 28°C), a minimal warm-up (drills and strides only) may be preferable to avoid elevating core temperature before the race starts. Hydration during warm-up becomes important.
Morning Runs
Core body temperature is at its daily low point within the first hour after waking. Muscles are stiffer, neural firing is slower, and glycogen stores may be partially depleted from overnight fasting. Morning races and sessions require 3–5 additional minutes on the warm-up jog and benefit from an extra dynamic drill set. Our guide on running frequency and training structure covers how time of day interacts with training quality.
Older Runners
Recovery time between sets increases with age, as does the time required to reach physiological readiness. Runners over 50 generally benefit from an additional 5 minutes on the easy jog phase and slower, more deliberate progression through the drills. The warm-up is not the place for intensity — take the extra time. Our guide for runners over 60 and our sprint training for seniors guide cover age-specific training adjustments in detail.
What Not to Do Before a Race
Static stretching. Holding a stretch for 20+ seconds before running reduces muscle power output in the subsequent effort. The evidence for this is consistent across multiple studies. Save static stretching for after the race or run — at that point it’s beneficial for flexibility and recovery. Dynamic movement achieves the same range-of-motion benefit without the power reduction.
Warming up too early. The warm-up effect dissipates rapidly after you stop. After 45 minutes of rest, muscle temperature returns to baseline and much of the preparation is lost. Finish the warm-up 5–10 minutes before the gun, not 30 minutes. If there’s a long wait between your warm-up and the race start, keep moving gently — don’t sit down or stand still.
Warming up with the fastest people in the field. Your warm-up pace is calibrated to your race intensity, not someone else’s. Running an 8-minute/km warm-up with a runner who races at 5 minutes/km will either push your warm-up too hard (their easy pace is your moderate effort) or theirs too easy. Warm up at your own pace, by yourself or with athletes at your level.
Skipping the warm-up to save energy. This is the most common race-day mistake, particularly among newer runners. The warm-up does not deplete the energy stores used during the race in any meaningful way — the easy jog and drills burn very little glycogen at low intensity. What the warm-up does is ensure you can access your aerobic system from the start instead of spending 1–2 kilometres getting there. For shorter races (5K, 10K), those opening kilometres are where the race is run. Starting cold makes them slower, not fresher.
Want a Structured Training Plan That Includes Warm-Up Protocols?
A well-designed training plan specifies warm-up instructions for each session type — so you know exactly how to prepare for tempo runs, intervals, and race days without guessing.
FAQ: Warm-Up for Runners
How long should you warm up before a run?
Depends on race distance. 5K: 22–30 minutes. 10K: 18–23 minutes. Half marathon: 14–18 minutes. Marathon: 9–14 minutes. Easy training runs: 3–5 minutes of easy walking or slow jogging. The shorter and more intense the effort, the longer and more structured the warm-up needs to be.
Should you warm up before an easy run?
Minimal warm-up only. Easy runs begin at low intensity and naturally self-warm-up in the first kilometre. Walk briskly for 3–5 minutes and then start running easily. Full warm-up protocols (drills, strides) are reserved for hard sessions and races where intensity is high from the start. See our running frequency guide for how easy days fit into the wider training structure.
What is the best warm-up for running?
Three phases: easy jog (duration varies by distance) → dynamic drills (leg swings, high knees, A-skips, butt kicks, hip circles) → strides (3–5 × 20-second progressive accelerations to race pace). The strides are the most important element for races and fast sessions — they prime the neuromuscular system to fire at race pace before the clock starts.
Should you do static or dynamic stretching before running?
Dynamic stretching before, static after. Static stretching before running reduces power output in the subsequent effort. Dynamic drills achieve the same range-of-motion benefits without the performance cost. Our guide on breathing and running preparation covers how the warm-up affects respiratory readiness as well as muscle readiness.
How do you warm up for a 5K race?
Start 35–40 minutes before the gun: 10–15 minutes easy jog, 6–8 minutes dynamic drills, 4–5 strides building to 5K pace. Finish strides 5–8 minutes before race start. Keep moving gently until the start. Do not sit down. See our sub-24 minute 5K guide for how warm-up integrates with race pacing strategy.
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