One of the best ways to get motivated is to try something new and exciting. Never hit the road in lycra? Never gotten dirty on the trails? Never ridden in to work? You can keep it simple by finding a few new loops to ride or people to ride with, or take it to another level by entering in a race you've never done.
There's a lot of the day that you could be using to get fitness. Swapping your car for a bike is easy for a lot of the short trips you do, particularly on the weekend. Riding down to the shops, park or pub is both great fun in the summer weather, as well as exercise you won't even notice you're doing. Products like Garmin Vivofit can also monitor the incidental exercise you do (or don't do), tracking all your movements on a stylish, discreet bracelet.
There's heaps of great products to help maximise your workout using technology. Quad Lock and Wahoo help harness your smartphone and free fitness apps to track, analyse and share your training. Sports watches and cycling computers can give you more detailed analysis on your performance, heart rate and other key metrics.