Most people are lazier than they'll like to admit. Many things people avoid doing isn't really as hard as they make it up in their minds. They are the ones that create a huge mountain in their minds and make it impossible of them to climb, and achieve what they want. As a result, they're reluctant to do anything.
Most times, laziness is as a result of fear. This is something that many people don't realize. When you're afraid of something, you'll avoid it by all means. People may think that you're lazy, but in reality you're scared. This is the reason why when you mistakenly allow your work pile up, you find it harder to start.
You find it harder to start because you're literally scared of the amount of work you'll be having to do. And that's why it's always important that you stay ahead of the game. Make sure you attend to your responsibilities early enough and as speedily as possible. This way you don't allow fear get into you.
You also need to confront your fears. Ask yourself, why aren't you really getting as much done? What exactly are you scared of? What's holding you back? These questions will allow you look into your situation and find out why you're afraid of that work, and acting lazy towards it.
Also indecision is another big reason for laziness. If your mind isn't fully made up, you'll always see yourself dragging in smaller decisions. Hence to tackle laziness in many ways, will have to do with you first - making a clear decision about what you have to get done. When you're clear enough, you don't hesitate as much, and you can act more.