Digging and lifting outdoors land it above leisure cycling for calorie burn.
Gardening mixes sustained light movement (weeding, planting) with short bursts of real effort (digging, lifting bags of soil, pushing a wheelbarrow). That combination of steady activity plus occasional load-bearing work is what pushes its MET value above general housework.
At 4.0 MET, gardening matches leisure cycling for calorie burn, despite feeling like a chore rather than exercise.