30 odd years ago I went through the fire academy. Ladders was the worst part for me.
At one point they had an extension ladder, fully extended, 4 ropes tied to the top of the ladder, (2 on left side, 2 on right side, 1 set was pulled to the front and 1 set was pulled to the rear, anchored to 4 guys on the ground, evenly spaced, maintaining tension on the ropes) The ladder was well over 30 feet. The obstacle was to climb up one side, over and down the other, while trusting your crew to keep the ladder upright. From the top it felt like 60 feet. The key was not to look around. Just look at each rung and plant your hand on it, one at a time. I fucking hated that obstacle.