Exercises should be done with nothing in your hand. Once you have full motion and good control, you may add a comfortable weight. This will help achieve strength, tone, conditioning, and endurance.
Stretching/motion aids - Broom, mop, cane, umbrella, rake handle, shovel handle, sport accessories (golf club, tennis racquet, ski pole, hockey stick, baseball bat, lacrosse stick), etc.
Weights - Small, medium, or large soup cans, small, medium, or large water (or any drink) bottles, casserole and/or sauce pans, small, medium, or large books, plates, etc.