For example, if you have to make cold-calls for your sales job, tell yourself that you're not getting up for any reason until you've made at least 100 calls. Regardless of what happens, refuse to stop until you hit your target.
Set a deadline.
Having a specific endpoint will really help to focus your time and energy. If a task doesn't feel necessary, chances are that it won't get done.
Set a goal each day (or night).
In the morning, decide what you want to accomplish that day. This can be even more effective when planned the night before. Once you have a sense of direction, you can spend all your time getting things done!