1
Lie prone (face down) on a flat surface with legs extended, arms at sides or slightly forward for support, body in a straight horizontal line
2
Engage core muscles and maintain neutral spine alignment; position arms to provide minimal support for stability
3
Lower both legs toward the ground by flexing at the hip and knee joints while maintaining core tension, controlling the descent without touching down
4
Drive legs upward by extending the hip and knee, contracting the quadriceps and hip flexors to return to starting horizontal position, squeezing at the top