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Doing exercise you enjoy is good - it helps keep you motivated. But sticking with the same routine week after week can also slow down progress because our bodies soon get used to it, explains Alisha Smith, education manager for the Australian Fitness Network which runs education courses for fitness professionals.

It's a message that's got louder over the last few years: exercise doesn't work for weight loss. There was the 2009 Time magazine cover story The Myth about Exercise featuring a photo of a woman pounding a treadmill, her eyes trained on a cream-topped cupcake. It symbolised the story's thrust: research suggesting exercise won't help weight loss because it makes us eat more to make up for the kilojoules we burn. It's a message repeated recently in the new book Big Fat Lies in which author David Gillespie - a lawyer - describes exercise for weight loss as 'pointless'. But is it really true?

Forget crunches. If you want to get faster, fitter, and stronger, you need to train your core like a runner.

'Josef, what is the best time of day to exercise?" is one of the top 20 most frequently asked questions I get at parties. The answer to this question is on two levels: practicality and physiology. Practicality is about what you can do - do today, do tomorrow and continue doing. Physiology is about what works best for your body. They don't always agree.

We all know that exercise is good for you, but how good? While previous studies have shown the link between physical activity and a lower risk of premature mortality, the number of years of life expectancy gained among persons with different activity levels has been unclear - until now. In a new study from Harvard-affiliated Brigham and Women's Hospital (BWH), in collaboration with the National Cancer Institute, researchers have quantified how many years of life are gained by being physically active at different levels, among all individuals as well as among various groups having different body mass indexes (BMI).

Which is more important in maintaining a healthy body weight? Diet or Exercise?

A healthy diet and the right amount of exercise are key players in treating and preventing obesity but we still know little about the relationship both factors have with each other. A new study now reveals that an increase in physical activity is linked to an improvement in diet quality.