Nope. Just you.
...
Just kidding!
There are some hills near my house. When I first started training, back
in January of this year, there is this one big hill I couldn't get up
without walking. 6 months later, when I ran that same hill, I didn't
even notice it. On my third triathlon this year, I came out of the water almost 4 minutes faster than I expected, with energy to spare. The hard training had finally paid off.
I certainly felt a bit superhuman, at least until I completed the bike and got halfway thru the run. THEN I think someone spiked my gatorade with kryptonite. Since then, I've been building up immunity, and will soon be strong enough to save the world!