Good tips above. I also heard of using an elastic band instead of the fiver (what can I say - how many elastic bands can you buy from a fiver?
)
Most controll comes from knowing your own body and it's center. Most sports teach balance and counterbalance - I'm sure that ridgid forms of dance teach it as well. It is most evedent in martial arts where the ebb and flow of movement & form should always be centered in the practicioner's body.
A few minor things that can help ballance are things like putting on your shoes without sitting down, (doing things on one leg helps balance) switch light switches on with your elbows (body and spatial awareness) Walk allong the kerb stones of the pavement (balance and movement) Close drawers, cupboards and doors with
just enough force to close them (control of force)
You also get "Balance Boards" and "Balance training tools" that are designed to improve balance (never tried one, but could be fun)