Having a strong core is vital for almost all exercises in Crossfit. It will help to prevent injury, protect your spine, improve posture and stabilse lifts and movement. Abs are also a nice side effect of building a solid core.
These lower abs workouts will help you to develop your midline, carve new abs and build a stronger core. Remember that without an intelligent nutrition plan, you will never see the results of your hard work, if that is what you want.