Gardening is not physically demanding and you don’t have to be incredibly fit to start a garden. However, gardening for at least 30 minutes can burn a few hundred calories. Digging, raking, bending down, and stretching in a garden engage all of your muscle groups, increasing strength, stamina, and flexibility. If you stay moving for more than 15 minutes, you will raise your heart rate and get more circulation throughout your body. Again, none of this is physically demanding, but these activities are still enough to improve your overall fitness.