Can you undo your past health mistakes?

You were a stranger to the gym

Damage done: People who take no physical exercise are much more likely to suffer from obesity, diabetes, a bad back and depression.

Bounce-back factor: Good. You'll get much fitter surprisingly quickly by doing just 30 minutes of activity every day. To avoid it being an uphill struggle, you need to tackle inactivity by the age of 40, when you start to lose muscle at a much faster rate.

Read more on exercise at any age