The 3-2-1 Speed Session

Workout - The 3-2-1 Speed Session

• 8min @ 7'00''/km
• 3 lots of:
  • 3min @ 4'30''/km
  • 1min rest
  • 2min @ 4'00''/km
  • 1min rest
  • 1min @ 3'30''/km
  • 3min @ 7'00''/km
• 3min @ 7'00''/km

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We’ve pulled together the essentials from The Running Channel’s Do 2 Shorter Runs = 1 Long Run? so you can start your workout right away. The full video goes deeper into each concept and is worth watching for more insight.

Key Points:

• One long run builds mental toughness in ways that splitting into two sessions can’t match; however, when your schedule is tight, two quicker efforts beat skipping the run entirely.
• A “321” interval structure is presented that works on a treadmill (via Zwift), outdoors, or both—versatile enough for 5K and marathon training.
• Quick technique note: the Runners Knot keeps your laces snug and high on your foot, easing pressure across the forefoot during sustained efforts.

Workout Example – The 321 Session:

1. 8‑minute warm‑up at conversational pace.
2. 3‑minute interval @ ~103% of your 5K pace (a bit quicker than race speed).
3. 1‑minute recovery @ ~70% of your 5K pace (loose and easy).
4. 2‑minute interval slightly faster than the 3‑minute effort you just finished.
5. 1‑minute recovery at that same easy pace.
6. 1‑minute hard interval – your fastest push of the set, really drive it.
7. 3‑minute cool‑down at easy pace.
8. Repeat the 3‑2‑1 sequence for a second round (a third round is optional if you have more in the tank).

Closing Note: Take this 321 session out for a spin today—personalize the paces using the Pacing app to match where you’re at, and notice how it energizes your training week. The full video has more background and answers to viewer questions; it’s well worth watching, and good luck with your runs.

References

• Do 2 Shorter Runs = 1 Long Run? | TRC Monthly Show - YouTube (YouTube Video)