Bent-Knee Hip Raise

How to do it

Lay flat on the floor with your arms next to your sides.
Now bend your knees at around a 75 degree angle and lift your feet off the floor by around 2 inches.
Using your lower abs, bring your knees in towards you as you maintain the 75 degree angle bend in your legs. Continue this movement until you raise your hips off of the floor by rolling your pelvis backward. Breathe out as you perform this portion of the movement. Tip: At the end of the movement your knees will be over your chest.
Squeeze your abs at the top of the movement for a second and then return to the starting position slowly as you breathe in. Tip: Maintain a controlled motion at all times.
Repeat for the recommended amount of repetitions.

What muscles does the Bent-Knee Hip Raise work?: Mainly the abs.
What equipment do I need?: Nothing but your bodyweight.
Is it good for beginners?: Yes, it is rated beginner level.
How do I track progress on it?: Log each set and beat the weight or reps from last time. Liftrung shows your last set beside the next one and estimates your one-rep max from your sets.

Exercise descriptions: free-exercise-db, public domain.