Seeing how I bruised my heel earlier this week, I'm can't do as much walking as I'd like. So, instead, I'm doing basic weight training using a set of dumbbells. As far as exercise investments, the dumbbells have paid off easily over the years. Though they don't have all the options you'd get from a full set of machines or weights, you do have a lot you -can- do with them. The trick I'm using is simple- I set up some task (in this case, job hunting) and at regular intervals (when I finish looking through a section), go do a set. It keeps me motivated and doesn't make it feel like a workout at all.