Ever find yourself thinking, 'I'm so lazy'? If you think of yourself as lazy, you'll convince yourself that you have no energy or focus. This may breed more laziness.
Come on, you're not lazy, but your thinking and behavior may be lazy. So, choose not to think of yourself as 'lazy'. Think: I am energetic and focused.
Get energetic and focused, and then think: I'll do what needs to be done for just 15 minutes. Start doing, and after 15 minutes, who knows, you may just carry on until things get done.