Do you see how unreasonable it sounds with the gym analogy? Yet how often do we apply the same unreasonableness to our children's behavior?
The first time you introduce a bottle, he might not understand it. Try again …keep going.
On a practical note, I think the idea to keep going is most important when sleep training because that’s when a mom is most likely to be looking for a magical quick fix. When no quick fix shows up, we start asking other moms what ultimately worked for their little ones. When those things don’t immediately work for our child, we get discouraged. But this is the place I really urge new moms to keep going.