Physical inactivity has been identified as the fourth leading risk factor for global mortality, causing around 3.2 million deaths each year. It increases the risk of developing diseases such as cardiovascular diseases, cancers, diabetes type 2 and obesity. However, considerable improvements in public health may be possible even with a small increase in physical activity level across all age groups. Great efforts should therefore be made, both at governmental and individual level, to encourage people to walk the stairs instead of taking the elevator, walk or ride a bike instead of driving the car or take an afternoon walk instead of spending time in front of the television. In this short commentary, overall health benefits of regular physical activity will be briefly summarized. We will also touch upon physical training, including strength exercise, as tools to improve health outcomes, and the use of self-monitoring as a device to assess physical activity levels.