It's the hard work too, and it can be uncomfortable. It's like Lynette said in the new series of Desperate Housewives - "which one of you has the breasts?"
Losing weight is the most important thing if you're on the tubby side, according to Cathy Ross.
Cathy should know - for she's a special kind of nurse, a heart expert employed by the British Heart Foundation.
On Friday, Sir Liam put out a special plea to families to carry on getting the swine flu jab - and he's even saying he thinks swine flu will be back, next winter.