The most frequent aim of tightlacing is a slim waist. Depending on the silhouette desired, the shape of the ribcage may be altered as well. Wearing a corset can also change the bustline, by raising the breasts upwards and shaping them, flattening the stomach, and improving posture. However, these effects are only temporary and will be lost on removing the corset. Indeed, excessive corset wearing has been claimed to weaken certain muscles, making it more difficult to maintain posture without a corset.