last letter first letter

Glomerulus

Rolling your bike... I know what you mean... but my brain has a different imaging of you rolling your back down a hill.
 
Trapezoid (bone)

Never really tried it, I don't even own a bike anymore.
And my imagination was you pushing the bike down a hill, and watching it roll. :P
But!!! If we do meet one day, I might just buy a mountain bike, and we can give it a try. ^.^
 

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