I like hiking for that reason - I like to go foraging for wild plants and mushrooms and the workout is a natural part of it. Gardening the same.Not if you follow a proper diet/eating plan and don't try to bulk up by overeating. Cardio is only essential if you want to speed up the fat cutting process.
That being said putting on muscle is a slow process so it's better to make it a lifestyle rather than using it to chase a particular result.
It's a good day when I have to claw my way up a few hillsides on all 4. In the rain. *Long as it isn;'t too f'n cold. **I'm 61.