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Lighter than your vital spark,

But dim the light, I bring the dark.

And silently, I change my pace,

But always covet second place.

Most joy when I'm behind, we run

Three-quarter dozen ones.

'I walk six paces of my feet, two yards I've crossed and fathom leaped,
But here I've come, the feats I've run and realised how I've fathomed none.'

Riddle Answer A Cloud

Riddle Explanation
but always covet second place - every cloud has a silver lining.

most joy when I'm behind, we run three-quarter dozen ones - to be on cloud nine.