Workout, but don't hurt yourself.
Here is a better way to lift weights and get some good resistance training.
Doing the reps slower, with more focus improves the quality of the exercise and makes it safer.
Less chance for injury or strain.
I love these Swiss Ball workouts.
There is a lot you can do with these balls and they really add to the diversity of the exercises.
It is a lot easier to get a targeted ab workout on a Swiss ball, as opposed to lying on the floor.