Russian Twist
Russian twists are a great way to workout your obliques, those muscles on side of our abs that help hold up our torso. It can be done with weights for added resistance and challenge. Russian twists can put some strain on your back, so be sure to keep your back straight as you complete the movement.
In a seated position on the floor, tilt your body back slightly, keeping your spine straight and shift your bodyweight to your butt. Lift your feet a couple inches off of the floor and place your hands together in front of you. Begin to twist your arms and torso to one side and your legs to the other, back and forth. This is also a fun partner exercise, where two people sit back to back and transfer a weighted ball by twisting side to side.