Twenty-five minutes at 5:00/km is the first landmark that separates a casual parkrunner from a trained one. This free 8-week plan gets you there using three types of targeted work — threshold runs that raise your aerobic ceiling, VO2 intervals that sharpen your top-end speed, and race-pace reps that make 5:00/km feel controlled instead of desperate at the 4 km mark. Four runs per week. No track required.
Breaking 25 minutes for 5 km means holding 5:00/km (8:03/mile) for the full distance. That sounds straightforward until kilometres 3 and 4, when accumulated lactate starts testing your ability to sustain form and pace simultaneously. The physiological requirements are modest by competitive standards — a VDOT of roughly 39–41 — but you must have trained specifically for that effort level, not just run lots of easy kilometres.
If your starting point is 28 minutes or slower, spend 3–4 weeks on easy running to build weekly volume to 25 km before beginning week 1 of this plan. The interval sessions in weeks 3–6 will overstress underprepared legs and increase injury risk.
The plan follows a three-phase progression: aerobic base and form (weeks 1–2), threshold and interval development (weeks 3–6), and taper with race rehearsal (weeks 7–8). Each week has one long easy run, one threshold session, one interval session, and one short recovery run. Total weekly volume rises from about 25 km in week 1 to a peak of 36–38 km in week 6, then drops for the taper.
| Week | Tuesday quality | Thursday quality | Sunday long | Total km |
|---|---|---|---|---|
| 1 | 20 min threshold @ 5:10/km | 4 x 800m @ 4:55/km, 90s jog | 7 km easy | 25–27 |
| 2 | 22 min threshold @ 5:10/km | 5 x 800m @ 4:55/km, 90s jog | 8 km easy | 27–30 |
| 3 | 25 min threshold @ 5:05/km | 4 x 1 km @ 5:00/km, 90s jog | 9 km easy | 30–32 |
| 4 | 25 min threshold @ 5:05/km | 5K time trial (tune-up) | 9 km easy | 28–30 |
| 5 | 28 min threshold @ 5:00/km | 5 x 1 km @ 4:55/km, 2 min jog | 10 km easy | 33–36 |
| 6 | 3 x 10 min @ threshold with 2 min rest | 6 x 1 km @ 4:50/km, 2 min jog | 10 km easy | 36–38 |
| 7 | 20 min threshold @ 5:00/km | 4 x 1 km @ 5:00/km, 90s jog | 8 km easy | 28–30 |
| 8 | 3 x 1 km @ 5:00/km, 2 min rest | Easy 30 min | Race day | 20–22 |
Easy run pace throughout: 5:40–6:15/km depending on your current fitness — if you can hold a full sentence, the pace is right. The most common mistake in this plan is running the easy days too hard. They exist to accumulate volume and promote recovery, not to add training stress.
Threshold pace (roughly 5:00–5:15/km for a target sub-25 runner) sits just below the point where lactate accumulates faster than your body can clear it. Running sustained minutes at this effort raises your lactate threshold — the ceiling at which you can hold a hard pace without accumulating fatigue debt. Each week the threshold block grows by 2–3 minutes until it reaches 28 minutes in week 5. After the week 6 peak (3 x 10 min with rest between), the work starts to taper as you consolidate the adaptation.
Thursday sessions target your VO2max. Running at 4:50–5:00/km puts you near that ceiling, training your heart and muscles to sustain higher aerobic output. The 1 km reps are long enough to accumulate real time at near-maximal intensity, short enough to recover fully between reps. If you can't hold the target on rep 4, slow down 5 seconds and cut the last rep — poor-quality intervals run too fast defeat their purpose.
The week 4 time trial and week 8 tune-up reps teach your pacing instinct what 5:00/km feels like under mild fatigue. Runners who only train at threshold or interval pace frequently go out too fast and blow up because they have no calibrated sense of goal pace. By week 6, five kilometres at exactly 5:00/km should feel brisk but sustainable.
At 25–38 km/week the recovery demands are modest but real. Eat a light carbohydrate snack before each quality session and take in 20–25 g protein within 30 minutes afterward. Sleep 7–9 hours — adaptation from interval training happens during sleep, not during the run itself. Two short strength sessions per week (calf raises, single-leg squats, hip work) improve running economy without adding meaningful fatigue.
In week 4, Thursday's interval session is replaced by a solo 5K time trial run at maximal effort. This serves two purposes. First, it gives you an honest fitness check at the halfway point — if you run 25:30, you're exactly on track; if you run 26:30, the second half of the plan needs adjustment. Second, it provides a VDOT update that Get-Split uses to recalibrate the week 5–7 session paces. A runner who starts at VDOT 38 and tests at VDOT 40 after four weeks will get sharper paces for the peak block — continuing to train at week 1 paces wastes potential.
Run the time trial on a flat, measurable course (a parkrun event is ideal). Warm up with 10 minutes easy running and two 30-second strides before starting. Record the split and enter it into Get-Split immediately after — the plan recalibrates automatically.
Generate my personalised sub-25 plan →Sub-25 is the beginning, not the destination. The physiological gap between sub-25 (VDOT ~40) and sub-20 (VDOT ~49) is real but bridgeable with 12–18 months of structured work. Once you break the barrier, re-enter your new 5K time in Get-Split and the engine recalibrates a follow-on plan targeted at your next goal — sub-22, sub-20, or wherever your progression takes you.
If you can already run 5 km non-stop and your recent parkrun or 5K time is 26:30 or faster, you have the aerobic base this plan builds on. If you're currently at 28 or 29 minutes, a 4-week aerobic foundation block first will set you up better.
Sub-25 requires an average pace of 5:00/km (8:03/mile). The plan's race-pace intervals train you at 4:55–5:00/km so that pace feels controlled, not desperate, at km 4 of your race.
Four runs per week: one easy long run (Sunday), one threshold or tempo session (Tuesday), one interval session (Thursday), and one easy recovery run (Friday or Saturday). Total time commitment is 3–4 hours per week.
Yes, but a watch makes the interval sessions much easier to execute accurately. For threshold and easy runs you can use perceived effort: threshold is 'comfortably hard — full sentences are difficult'; easy is 'can hold a full conversation without effort'.
Skip it and carry on. Do not double up the following day. Consistency over eight weeks matters more than any single session. If you miss two or more consecutive days due to illness, repeat the previous week rather than pushing into the next block.
Enter your most recent timed 5K result in the plan wizard. Get-Split calculates your VDOT and sets every session pace — easy, threshold, interval, race-pace — from that number. A mid-plan time trial at week 4 lets you recalibrate and sharpen the second half of the plan automatically.