I have been trying remove the words "be careful" from my vocabulary because they have a negative connotation and assumes that the child isn't being careful.  Not only is Gia being careful, but she is also assessing risk, taking her time, testing her personal limits, and practicing her balancing skills.  What you don't see is that this was her 3rd attempt.  She fell, she crashed, and she slipped, but she was 100% determined to cross that log.  Why put my worry on the students?  When engaging in risky activities, I simply ask, "Do you feel safe?" Can you tell I ask this question a lot? ;)