Well, like I said, I don't backpack to challenge either my mental or physical toughness, and I see no need, and have no desire to do that.

As opposed to pushing my limits, my approach has been to extend my boundaries.

I suppose the end goals may be very similar, but the means of getting there are quite likely very different. So, while I wouldn't admonish you for wanting to challenge yourself, I think most here might caution you to be well prepared for what you're doing.

A few years ago JimShaw encouraged us all to test our rain gear in our bathroom shower. I think he said to put the shower on full blast and stand in it for 15 minutes. His assumption, I believe, was that if you don't come out dry you're not prepared for rain.

I think that's a pretty good example of how one might extend their boundaries without pushing their limits.