person A: I'm going rock climbing with some friends!
person B: That sounds fun and scary! You must be pretty fit to take on that challenge.
person A: I have done some climbing indoors for practice_comma_ but never done a big climb out doors_comma_ so who know how it will go.
person B: I'm sure that there will be some differences_comma_ but I'm sure you will nail it! Just remember to be safe!