Session of the Month: 3 × 5km with 1km Float

A session built around patience, rhythm and aerobic strength. 3 × 5km with a 1km float recovery is a staple to any marathon build, a substantial workout that challenges you to maintain control over a long period, while learning to keep moving efficiently when the pace backs off. 

Why We Love It

There’s nowhere to hide in this one. With 15km of quality running and 2km of float recovery between reps, it rewards consistency over raw speed. It’s a great session for runners building towards longer races, particularly the half marathon and marathon, where the ability to sustain an effort without surging is key. 

How to Run It

• Warm-up: 4-5km easy + drills and strides
  
  

• Main set: 3 × 5km with 1km float
  
  

• Cool down: 3-4km easy
  
  

Complete 3 × 5km at a controlled, comfortably hard effort, with 1km of float running between each repetition. The float should be slower than the work reps, but not so slow that you completely switch off. Think steady, relaxed running that allows you to regain control of your breathing while keeping the legs ticking over.

The goal is to make all three 5km efforts consistent. Resist the temptation to push too hard early, and aim to finish the final repetition feeling like you’ve worked hard without losing form or control.

Training Zones & Focus

The 5km efforts should generally sit around marathon effort, depending on your experience and training goals. The 1km floats should be kept at a steady aerobic effort, allowing partial recovery while maintaining momentum.

Focus on even pacing, relaxed mechanics and controlled breathing. The floats are an important part of the session, so avoid turning them into a complete recovery or pushing them so hard that the quality of the next repetition suffers.

Key Benefits

• Aerobic strength - Builds the endurance needed to sustain a strong effort over longer distances.

• Pacing discipline - Encourages consistent running across extended repetitions.

• Fatigue resistance - Teaches you to maintain form and rhythm as the session progresses.

• Active recovery - Develops the ability to settle into a steady pace without fully switching off between efforts.

• Race-specific preparation - Particularly useful for 10km, half-marathon and marathon training.