I captured a few frames during this sequential climb, but this one – with the searching foot – ultimately prevailed.
(please click on the image to view)

↑Leica M9 and Voigtländer Nokton 40mm @ f/1.4.
After studying this for a while, I realized why I preferred this image to the others.
The floating foot, adds a dynamic quality to the image. We know he’s climbing, but with the foot between rungs, his movement is emphasized and there is a (tiny) sense of drama: will he find his footing?
More than this, the same lower foot, though not connected to the rung, completes a rung-to-limb schematic echoed in the two rungs above, that ultimately converges and directs our attention to his face (see red arrows below):
(please click on the image to view)

It’s interesting to tease these little visual cues out, though I’d much rather enjoy the images for what they are: precious, personal moments… frozen in time.