Dr. Mike Evans is a big advocate of preventative medicine, and in this brilliant video, he researches what one thing would make the biggest difference to our overall health.

He lists various interventions, such as cancer screening, dietary improvements, and lifestyle changes. But wants to know, what single activity would give you maximal health benefits with minimal effort?

What could positively impact conditions such as arthritis, dementia, diabetes, fracture risk in post-menopausal women, depression, anxiety, and overall quality of life?

The answer? Walking. It's that straightforward. And just 30 minutes a day can give us significant health benefits.

He concludes with a rather thought-provoking question. Can we limit our sitting and sleeping to just 23 and a half hours a day?

Watch Youtube video: 23 and 1/2 hours: What is the single best thing we can do for our health?