I just realized this recently, but since when did I become so freakishly strong all of a sudden? Granted, I was already pretty strong, as is, but this came as a surprise for me for the moment. Basically, not too long ago, I had to move a stone or cement statue/umbrella stand up a floor (from my back yard to the porch just above), and this thing is pretty heavy, and in the past, wore me out, or at least made my arms ache a bit, after hauling it a short distance. Not this time, I was able to run the whole length (roughly triple the distance that wore me down other times) with the thing like it's core was made of dense styrofoam, and nary broke a sweat by the end. My arms and even fingers showed no signs of wear. Where'd all this strength come from?
I don't recall ever really working out lately, but then again, spending every other day cleaning up the lot (under pretty hostile sunny conditions), and the marathon-run all week of working on the yard and the rest of the lot (under similar or same conditions) some more since some of my mom's old friends/siblings are visiting... All I can say is screw the gym, doing yard work for hours on end is the way to go, and is a constructive way to work out anyhow.
EDIT:
And in case you're wondering, the yard work mostly involved essentially of pruning quite a few trees back into the recognizable forms they used to have (especially thanks to tons of vines (with thorns, and apparently poisonous; apparently making me rather poison-resistant, considering how many times I've been cut and had to remove thorns out of my feet/fingers.) that were practically eating away at the trees as well + trimming the few-many dead branches), and we're not done with all of them yet, disposing of the brush left behind, cutting back some rather annoying grass that doesn't like being cut down by a weed-whacker (since we lack a lawnmower, plus it's more for lawn maintianence anyway) and resorted to using a hedge trimmer (which was, by my experience, far more precise, and fun as hell getting vengeance on those damn weeds/grasses that eat up trimmer-cord like nothing else; like a mini-chainsaw. Cue Doom music.), and of course, lastly, cleaning up any crap laying about the lot. I think most of the time, I had to 1-man army many of the listed.