Run on me

I have many colours
I have many lands
I have many names
Run on me

I will flatten your feet
I will annihilate your ankles
I will crush your calves
Run on me

I will splint your shins
I will knobble your knees
I will thump your thighs
Run on me

I will hamper your hamstrings
I will hit your hips
I will squash your spine
Run on me

I am hard
I am smooth
I am unforgiving
Run on me

I am the master of muscle mastication
I am the mistress of maddening misery
I am TARMACADAM
Run on me