I'm going to tell everyone I'm going to drink after a stressful day, but I'm actually going to workout
Why do you lie about that?
I want them to see me later with a nice physique out of the blue.
You shouldn't lie about things like this because it's weird. People would respect you more if you told them the truth. There is no reason to lie here.
I won't be honest. I like this way better.
People will know you have been going to work out when they see you eventually. Lying about it serves no purpose except for others to not trust you.