OPP is a practical guide to refining your posture instead of trying to mimic an impossible ideal. The approach is a combination of strength and mobility exercise, habit change, and awareness of how you align your body in regular activities. Well-researched and backed by lots of hands-on experience by two veteran trainers / physical therapists.
True-Fi makes my crappy, five year old wireless Sony headphones sound *almost* as good as my open-backed Sennheisers. It's not cheap, and it's not perfect, but if you regularly listen through headphones, it can make a huge difference in sound quality and overall experience.
