Once a day, lie on back and "deflate the balloon" (mine's more like a beach ball) by pushing the belly button down toward your spine without inflating the stomach. Perform this exercise at 50% or less of full effort. Put your fingers on the lower abdomen and feel the stomach going in.
The second exercise is more easily described. This image should suffice.
Coming next week: Exercises rated most effective, and tai chi for Parkinson's.