Update your music collection on your iPod.
I find music helps to keep me going and makes the gym more interesting. It also helps me to work out faster if I chose a beaty number.
Also, think of new ways to exercise, like taking up a new activity, whether it be surfing or cycling or skiing.
Habits take 3 weeks (is it?) to become established so if you can decide what you're going to do, stick with it and gradually you will find it easier to maintain.