How could we improve our body fitness?

See below: A good start would be to try and walk 30min/day 3-5 times per week. You will also want to add resistance training to help build lean muscle mass and help burn more calories.

Exercise: It doesn't have to be in the gym, any form of physical activity, even house work can help ... particularly if you are referring to cardiopulmonary fitness. For cardiovascular health, the American Heart Association recommends 30 mins of moderate-intensity aerobic activity 5 days/week or 25 mins of vigorous aerobic activity 3 days/week and resistance training 2 days/week