Eh, you know what? I'll just show you. Plenty of warm water to change back too.

[He grabs a cup of water, pours it on himself and in a matter of seconds he transforms into a shorter girl with red hair and curves. Ranma still had the muscles of a martial artist and about the same hair length, but most else was different.]

Pretty different. I figure it must be similar to the woman that fell into the cursed spring to begin with.