To do that we've started a fitness plan at the gym. We're going daily and working out for an hour. That hour includes a lot of time walking and running on the treadmill to help increase our endurance. I did about 100 crunches on the ab machine yesterday, I need the work there.
Funny--last night when I was running on the treadmill, Sebastian asked me a question and that somehow threw off my stride and I nearly ate it!