There is one more point that can really get you motivated. I call it the cliff-hanger approach. I use it mostly for programming but you can use it for other aspects too.

Anyway, it goes like this. Whenever you're leaving work, make sure to leave at least one thing nearly done.

Like one failing test which you know how to fix, a function that you've just started writing but haven't completed.

This way you have a starting point the next day and it really helps to get the ball rolling.

On a related note, another approach is to make things easier for yourself. I think it's all about getting over the static friction (time before you get the ball rolling). This approach is to prepare for the next day in advance. Like have your running shoes and socks ready by your bed, have a glass of water and a lemon (+knife) on your kitchen cabinet before going off to sleep.