If you're working a 8-5 desk job, there's a high chance you slouch over your keyboard 80% of your day and probably go back home with an achy back. However, once you get home, if you spend about 15 – 30 minutes stretching out your back with a number of yoga postures, you'll not only eliminate any aches, but this will inherently improve your body posture, whether you're sitting, standing and even walking.