Anatomy Fact Check: Can Workouts Change a Low Crack Bum into a High Crack?
By Marcus Vance
Most gym-goers who believe they "raised their crack" actually altered their infragluteal fold. Commonly referred to as the subgluteal crease or the bottom butt fold, this horizontal groove forms where the lower convex margin of the gluteus maximus meets the upper posterior thigh. It is supported by a distinct fascial condensation that anchors the dermis to the ischial tuberosity.
When an athlete performs heavy hip thrusts, RDLs, and step-ups, the inferior muscle fibers of the gluteus maximus expand. Simultaneously, reducing overall body fat trims the superficial adipose layer that pools near the base of the cheeks. This dual process sharpens the infragluteal fold, lifting the bottom perimeter of the muscle away from the hamstring. The entire glute complex sits higher on the leg. Because the lower border elevated, the eye perceives the entire posterior chain as lifted. The top of the crack did not migrate a single millimeter; the bottom of the cheek simply gained clearance.
Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.
