Practicing good posture is essential for good health. So therefore habitually doing things that cause poor posture IS BAD.
Things like cradling a phone on your shoulder, wearing high-heeled shoes and looking down at your cell phone are all habits that lead to poor posture.
Another one is sitting on a wallet. I discuss the problems associated with sitting on you wallet in this video.
Gentlemen: It's time to stop carrying that wallet in your back pocket
Ladies: It's time to get your man to . . . stop carrying that wallet in his back pocket.