Answer:  Absolutely!  Some people think gardening isn't really exercise, but after you do the mental work of planning your garden, making your list of seeds, plants and tools needed, the real "work" begins.  Working in a garden requires bending, lifting, digging, carrying and moving - a lot!  You are using your whole body.  Shoveling soil and compost, lifting 40 pound bags of mulch, pulling weeds, planting and dividing plants are serious physical activities.   There's always something to do in the garden from spring planting and weeding to fall cleanup.  Do NOT forget to stretch your muscles, especially your back when you are finished.