Excess weight becomes a problem when it is not supported by strong, well-aligned bones and muscles. When the body is consistently aligned along its central axis, the entire weight is distributed vertically along that axis. Every part of the body is equipped with sufficient muscles to support itself: the feet, the pelvis, the torso, the ribcage, the neck, and the head. Nothing “rests” on what lies beneath it. Everything supports itself.
The threshold for defining “overweight” is becoming very flexible. Someone who slumps over and sags can be “overweight” for their bones and joints even if they’re underweight. Someone who stands tall and straight, using 100% of their available skeletal muscles, can easily carry a few kilograms above the statistical normal weight. On the contrary: a person who moves with good posture and is a few kilograms overweight is often better off than an underweight person who avoids exercise.