How to do: Otis-Up

Step-by-step instructions

1. 1Secure 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.
2. 2Initiate the movement by flexing the hips and spine to raise your torso up from the ground.
3. 3As you move up, press the weight up so that it is above your head at the top of the movement.
4. 4Return the weight to your chest as you reverse the sit-up motion, ensuring not to go all the way down to the floor.

Photos & base instructions from the open-source Free Exercise DB (public domain).