I'm going to tell my friend that her boobs are just alright.
Why would you say your friends boobs are just ''alright''
I think she should work out a little bit more after seeing her naked
Your friend must have a lot of trust in you to have allowed you to see her naked. Insulting her would be very hurtful. This is not behavior you should practice with friends or anyone else.
Maybe I was a little harsh.
Yes, I'm glad we talked about this before you told her anything about her body. People can be very sensitive about their appearance, and so it's best to keep some thoughts to yourself.