This exercise offers abdominal and oblique stimulation while also adding a hip mobility element into the mix. This helps the body distinguish the difference between the hips, pelvis, and lumbar spine so that they don't all move together as one unit.

Try elevating the feet. It increases the difficulty of the plank while also working on hip mobility.

Related:  Core Training for Big, Heavy Dudes

Related:  Do the Tiger Bend Push-Up