Castaway Physique
From A KoL Wiki
The drink you just drank made you feel like you'd been marooned on a desert island, and that instead of just giving up and waiting to die, you learned to fish and found fresh water and got all buff and awesome.
Which is only slightly more likely than the fantasy where you're badass group leader after the zombie apocalypse, instead of an appetizer. Still, you're feeling a little stronger.
Muscle +25%