1. Take a break. Most office jobs leaves us sitting at a desk for long periods of time, allowing us to sink into our chairs. Set your computer to ding every hour as a signal to stand up, stretch, roll your neck/shoulders and readjust. Get up to grab a drink of water too, it will help get the blood circulating, give your eyes a rest and rehydrate you.
2. Raise your car's rear-view mirror. Angling your mirror up slightly teaches you to sit up straighter behind the wheel and elsewhere.
3. Move your monitor. Your neck is an extension of your spine so tilting your noggin down or back to see your screen can promote poor posture. Adjust your screen's position at your desk so that you gaze straight ahead. Also, be mindful of your position as you use gadgets such as laptops, iPads, even gadgets such as phones for long periods of time.
4. Stand tall in mountain pose. Practice tadasana (the mountain pose) by balancing your weight equally between both feel and imagine they're rooted to the floor. Visualize the crown of your head being pulled from above and you keep your abs tight. An easy way to bring yourself into a correct posture at any time is to tightening your abs, that will always align your spine correctly.
5. Do kegals. Contract your pelvis as if stopping a flow of urine. Working the pelvic floor and other muscles of the core stimulates muscles along the spine that encourages it to lift and elongate. It also is a great exercise to help prevent incontinence.
A regular yoga practice will help correct your posture. In yoga we work on lengthening the spine, increasing the space between each vertebrate, resulting in a taller, prouder you!