There are lots of different movements in gardening, so you get some exercise benefits out of it as well
Gardening is hardly pumping iron, and unless you're hauling wheelbarrows of dirt long distances every day, it probably won't do much for your cardiovascular fitness.
But digging, planting, weeding, and other repetitive tasks that require strength or stretching are excellent forms of low-impact exercise, especially for people who find more vigorous exercise a challenge, such as those who are older, have disabilities, or suffer from chronic pain.