Apparently that's what I like to do, after running a nice 5 miler yesterday with a dear friend, and then letting her talk me into running up a particularly steep hill, twice, just for kicks. Kicks in the tookus. And then, deciding I needed to lift, doing a powerful lower body set followed by 80 squats, and some abs for good measure. Enough already, right? Guess not. When the husband got home later in the evening, he suggested the three of us go for a walk after dinner. So we did. Our walk turned into a trail run with the little guy who kept begging me to "run, Mama, run!" How can I say no to that? So, I probably tacked on another 2 miles running around with him, plus the walk back to our house. Was I pooped last night? A bit. Was I sore this morning? You betcha. And it hurts sooooo good.
I've found that the times I see (er, feel) the most results shortly following a workout are when I've pushed myself beyond what I planned to do, or beyond what felt like enough. How do we ever really know what IS enough? In my opinion, you've gotta listen to your body. If something hurts or feels off, it's probably a good idea to stop when you planned to stop. But, if you're just feeling tired, 95% of the time your body can take more, so give it a little more and see what it does for you. See you how feel the next morning. See how you LOOK the next morning - you just might like what you see in the mirror.
Enough ISN'T always enough. Push yourself and you'll be surprised at just how far you can go.