There are subtle and powerful psychological and contextual barriers that block many of us from getting the physical activity we want—barriers like fatigue, not having enough time, or embarrassment.

If you call someone “selfish,” they are likely to be offended. Selfish is thought to be a defect and is undesirable. For this reason, most people think that selfishness is bad for intimacy and ...

If someone is self-centered, they usually don't reciprocate the effort you put into the relationship. They may also disregard rules, believing that rules and guidelines don't apply to them. To cope ...