Making strained facial expressions while lifting heavy weights promotes the appearance of wrinkles, and the use of a muscle relaxant (such as Botox) allows for smoothing and preventing them by limiting these repeated expressions.

noli's read

The idea that repeated facial expressions, such as grimacing during weight training, promote fine lines is validated by skin science. The American Academy of Dermatology (expert opinion) confirms that the repetition of these contractions marks the skin over time by weakening its local elasticity. Regarding the preventive effect of muscle relaxation, a long-term observational study on twins published in Archives of Facial Plastic Surgery showed that limiting these movements effectively prevents the appearance of permanent wrinkles. Nevertheless, presenting physical exertion as an enemy of skin youth is incomplete. Indeed, randomized clinical trials (such as a study published in Scientific Reports) indicate that weight training improves skin thickness and texture by stimulating overall cellular vitality. It is therefore a matter of finding a balance between small, localized expression lines and overall skin rejuvenation through exercise.

the sources

No named source held this one up — that absence is part of the verdict.