Last week Au, Target and/or Guido had exercises on what in Norway is called tredemølle.
I prefer climbing in trees outdoor. This is one of my ways from the ground up to the veranda. The other I must jump from a pine branch high up. The branch is swinging up and down long after the jump. I end gracefully with a thud on the railing if I can say so! It requires precision like an acrobat.