On one side of the equation are the calories we consume. Onthe other side are the calories we burn — through physical activity aswell as whatever is needed just to keep the body in good working order.

Indeed, it is important to keep fit and healthy, whilst we all aspire to improve the way we look and feel in order to make good first and lasting impressions.

Even when in use, they require a lot of maintenance—to adjust them from child to child, to keep them in good working order and to keep them clean.