Last challenged yourself physically?

[Highlander]

I can honestly say that I challenge myself quiet often,....... I just love to get the dogs out and hike into the hills with very little in the way of equipment and stay out for a week or more.
This is usualy done in the summer I grant you, but I have also been known to do the same in winter

It is the only way I do challenge myself though, and I am sure there are other ways,.... but they wouldnt be as enjoyable to me