I'll second this. Climbers tend to get at least half-way decent estimating the weight of other climbers because it's pretty relevant if you're lead belaying som

I'll second this. Climbers tend to get at least half-way decent estimating the weight of other climbers because it's pretty relevant if you're lead belaying somebody. In fairness, we're usually estimating the weight of people of fairly fit builds, but with some practice estimating people of other builds, I agree that you'd get within 10%.