My friend Used Ad Populum Appeal to Force!

I am scare! Please do not do that to me!

Today my friend use force in order to made me go to the gym with him. The conversation is as below:

J : Wee Lon, later after dinner you must go to the gym with me!
I : Why? I don't want to go.
J : If you don't go later , I will disseminate all of your secrets to all others people! Especially recently you had done something that is....
I : Please don't! I will follow whatever you want!

So, J used Ad Populum Appeal to Force or on other word Ad Baculum to make me to go to the gym with him. I really don't like this! But, he has my secrets, I have to do whatever he wish.