When I really need to blast through a lot of work, but really don't want to, I use the (10+2) * 5 method invented by
Merlin Mann.
It's a modified Pomodoro method, but instead of 20 minute work sessions followed by a 5 minute break, it shortens both work and break times. I prefer (10+2)*5 to Pomodoro because the 10 minute start seems do-able, whereas the 20 minute block often seems insurmountable.