'Exercised' highlights the fact that aversion to exercise is in fact evolutionarily motivated (to avoid 'wasting' energy on unnecessary activity, in a sense). The book works towards showing and explaining the myriad benefits of exercise for various aspects of our physical and mental health as we age, both at a high level and from a more mechanistic point of view in the body. Informative, and useful as a friendly guide to motivate getting more exercise, but slightly repetitive in places.

The main advice is summarised as: "Make exercise necessary and fun. Do mostly cardio, but also some weights. Some is better than none. Keep it up as you age."