Welsh Runner's Threshold Builder
Workout - Welsh Runner's Threshold Builder
- 15min @ 5'30''/km
- 4 lots of:
- 20s @ 3'00''/km
- 40s rest
- 3 lots of:
- 0.0mi @ 7'30''/mi
- 3min rest
- 12min @ 6'30''/km
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A breakdown of “ALL IN: EPISODE 3 - THRESHOLD, PARKRUN, AND COMPETITION TIME” from The Welsh Runner. Here’s the main workout so you can run it; grab the full video for context.
Key points:
- Threshold training holds an effort just past aerobic threshold (around 5:15-5:20/mile for Matt). It trains your body to process lactate.
- The core session: 3 x 2 mi at around 5:30/mile, with 3 min easy jog between.
- Build into the effort gradually. Hit pace, let heart rate settle, don’t ramp intensity.
- Parkrun (5 km community event) is a pressure-free way to practise pacing and build resilience.
- The episode has Matt asking viewers to predict his 10K. The same workout can help you dial in race-day pace.
Workout:
- Warm-up: 10-15 minutes easy plus a few short strides.
- Threshold set: 2 miles at 5:30/mile (or half-marathon pace). 3-minute easy jog between reps.
- Repeat 3 times (6 miles of threshold).
- Cool-down: 10 minutes easy.
If 5:30/mile is too aggressive, start at 5:45/mile and drop the pace over the weeks. You can use heart rate (around 181 bpm) instead.
Practical take-aways:
- Build gradually: 2 x 1 mi, then 2 mi, then 3 mi, eventually a full 5 mi at threshold.
- Use parkrun or a 5 km route as a testing ground for effort just short of lactate.
- Heavy legs signal real work, but keep recovery jogs genuinely easy.
- Mix threshold sessions with steady miles and a weekly long run (up to 10 miles).
Closing note: try the 3 x 2 mi threshold this week, adjust paces to where you are, and plug it into the Pacing app to track gains.