Why it's good for you: Singing boosts your mood by releasing endorphins. It's also an aerobic activity that helps your heart and it exercises muscle groups in the upper body, even when you're sitting down.

Fitness tips: Singing is great way to exercise the lungs. Believe it or not it does burn calories - especially if you're dancing too.

Typical meal: Leona Lewis follows a vegetarian diet, favouring pineapple and macaroni cheese. Cheese can be bad for cholesterol but if you choose a strong cheese you're likely to use less. Pineapple is full of vitamins and this combined with vegetarian favourites such as beans and pulses - will aid the digestive system.