I didn't read through all the replies, but I think that it's a combo of doing the certain activity plus your body type that will determine how you look. Personally, I don't lift much anymore because I ALWAYS get too big (yet I keep trying to make it work anyways). The only way I've stayed lean without starving is eating primal (without overeating), and yes, rock climbing. I love ballet, but it bulked me up as well. My lower half just bulks up really easily. Experiment and see what works. I'm actually one of the bigger (as far as bone structure) climber girls, but I also have more muscle. I have pics on my page that might help illustrate--but everyone will look slightly different just depending on their body type.
"The mountains are calling and I must go."
"I don't know what's wrong with me, but I love this shit."
"Think like a geek. Eat like a hunter. Train like a fighter. Look like a model. Live beyond."