Here's a good way to stick with your personal training goals: create a competition with your coworkers. Whoever manages to exercise regularly on a set schedule for three months gets a prize; whether they've reached their goals doesn't matter as much as if they've tried.
Want a simple way to motivate yourself to do your personal training? Change into your workout clothes. Once you've got them on, you may as well go work out. It may seem simplistic, but once you're past that barrier of getting dressed, it's often easier to do the right thing.