Clark paused to stretch and wipe his brow. The sun baked down on him, and even though the fence posts weren't heavy to someone with super-strength, the constant bending and fetching more posts from the truck-bed was giving him a good workout. This far from any roads he could let go and move naturally. He had even taken off his T-shirt, which he never did publicly, unless Pete was equally bared.
Next to half-naked Pete he could probably levitate and no-one would notice...
Clark adjusted himself furtively, and glanced around, then went back to work at normal human pace.