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Bent-knee calf raise

The soleus — the deep calf muscle that takes over when the knee is bent.

You need
A stair edge and a wall.
Why it is in the plan
Uphill and at slow ultra pace the knee stays bent, and the soleus carries much of the load. Straight-knee raises share the work with the bigger calf muscle; a bent knee puts it on the soleus.

How to do it

  1. 1Stand on the step as for a calf raise, then bend the knee a little — about a quarter squat — and keep it there.
  2. 2Rise onto the ball of the foot without straightening the knee.
  3. 3Lower slowly until the heel is below the step.
  4. 4Start on both legs. Move to one leg when 20 clean reps feel easy.

Easier

Both feet on the flat floor, back against a wall.

Harder

One leg at a time, then a backpack.

Common mistake

Letting the knee straighten as you rise. The bend is the point.

Gym version: Seated calf raise (machine or dumbbell)

Used in: 50 km ultra, 100–120 km ultra

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