Gardeners can be a smug lot. Not only do they derive great satisfaction (mostly) from doing what they do but also they know just how good it is for them to do it (mostly). The media regularly reports on the beneficial impact gardening can have as a form of exercise, particularly for the elderly, and often promotes the therapeutic value of gardening (as a stress reliever, for people recovering from physical or mental trauma or for people suffering from dementia for instance).