Putting stupid inflatable ball in bed while you sleep on the floor to exercise your core muscles when you have to get up off the floor to pee during the night, all 8 times.
I love doing twists, russian twists I think some are called. Sit on your butt bones (or on stupid inflatable ball) and if you want, lift your feet, knees bent 90 degrees, a few inches off the floor. Using a LIGHT weight (no more than 5lb!), hold the weight just in front of you and turn like you are handing it to someone behind you, then turn the other way. Lower body stays still. An alternative is to sit on the floor, and when you turn, place the weight down on the floor and let go. Then, reaching around from the other side (if you can reach it), grab it and bring it back around again, making a full circle. Switch directions often and keep both sides equal.
Also suggest oblique crunches; sit up position with feet either on the ground legs flat, or knees bent 90 degrees with feet up off the ground entirely. Hands behind your head, sit up until your shoulder blades are off the ground and touch your elbow with the opposite knee. If you want, afterwards you can straighten that leg out and lower it, but don't let it touch the ground. This gets your core, cardio, and your butt, big time!
Lastly, take stupid inflatable ball on a dinner date for being so generous.
I have said what I have said. I have not said what I have not said.