I'm floating on a cloud, and ready to kick ass at the same time.
Sounds like you're on amphetamines...
Runner's high. Half marathon.
I'm a fat guy. I've never gotten a runner's high.
Is there a particular drug you could compare it to? I imagine it's something like meditation high, which I've recently started getting.
I'm a slow, fat and lazy runner. Don't think I've experienced the runner's high either.
When I feel lightheaded, it's low blood sugar. The "rush" is just my metabolism being kicked into high gear.
The "high" I've been on for last 24+ hours is general sense of accomplishment and well-being, which is probably more in line with a meditation high. I have a similar feeling when I've been in hot yoga for 90 minutes, so yeah - that's probably it.