Otis-Up

How to do it

Secure your feet and lay back on the floor. Your knees should be bent. Hold a weight with both hands to your chest. This will be your starting position.
Initiate the movement by flexing the hips and spine to raise your torso up from the ground.
As you move up, press the weight up so that it is above your head at the top of the movement.
Return the weight to your chest as you reverse the sit-up motion, ensuring not to go all the way down to the floor.

What muscles does the Otis-Up work?: Mainly the abs, with help from the chest, shoulders, triceps.
What equipment do I need?: Other equipment.
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.