The discipline of the cold start
Most people don't quit in the middle. They quit before they start. The hardest rep is the one where you put on your shoes. Win the cold start and the rest mostly takes care of itself.
Motivation is a liar
Waiting to "feel like it" hands your day to your mood. Disciplined people don't feel more motivated — they've simply made starting require less. They lowered the activation energy until beginning is almost frictionless.
You don't rise to the level of your goals. You fall to the level of your systems. The cold start is a system, not a feeling.
Make beginning automatic
Shrink the first step until it's laughable: shoes on, one page, two minutes. Attach it to something you already do (after coffee, before the shower). Lay out the gear the night before so the morning has no decisions left to make.
The two-minute rule
Commit only to two minutes. Two minutes of training, of reading, of focus. Two minutes is short enough that you can't argue with it — and long enough that you usually keep going. The goal isn't the two minutes. It's crossing the threshold from not-doing to doing.