One good exercise is the superman exercise. Lay face down with arms extended in front, and repeatedly lift and lower arms and legs simultaneously. This strengthens the lower back. Another good option...
The exercise ball will strengthen different muscles depending on how you use it. It's probably most popular and frequently used for an abdominal work out.
Kegel exercises are exercises of the supporting muscles of the pelvic floor, the pubococcygeus muscles, also called the PC muscles. They are prescribed for women and men in order to strengthen their...