I'm going to try hard not to write a novella on this topic as I often catch myself doing. I'll just say this: You must be a lot luckier than I am or maybe my outdoor activities are simply more prone to causing injury. I can say without a shadow of a doubt the part of my body that sufferes the most injury outdoors are my hands. Based on my own personal experience, being able to operate your equipment one-hand is of great importance.