5.9K views · 177 reactions | KB DEAD BUGS OFF A BENCH are a great dead bug variation to work on dissociation of hip extension from lumbar movement. Lock the lumbar spine down on the bench as the leg is lowered into full hip extension. . This makes a great post hip flexor mobility work drill or as a drill for athletes that always extend their lumbar spine with any hip extension drills. | The Barbell Physio | Facebook