Milk is for babies. When you grow up you have to drink beer.
I think that the only way that you really keep it a secret is by not telling anyone.
Do you have to discipline yourself to have breakfast, lunch or dinner? Of course not; and so discipline - the usual concept of it - doesn't apply here. I had to discipline myself to learn English, but never to train.
I'll be back always sounded a little girly to me.
People get very creative if you include them.
My only rule is to keep moving, for a pump and cardio at the same time. Rest as little as possible. After an hour, you will feel fantastic and your muscles won't know what hit them.