This exercise is used to strengthen the lumbar paraspinal muscles and posterior core, as well as the gluteus maximus
Demonstration and Instructions
Lie over a bed / bench / table with your pubic bone on the edge and hold on with your arms. Slowly raise both legs up to horizontal - hold briefly at the top engaging your lower back muscles - and then slowly lower back down to the floor with control. Repeat 10 times
Special Notes
Legs do not need to be lifted so high so that the lower back is in hyperextension