What kind of rack?
A treadmill rack for a home gym is just a rack that can help to move the treadmill around for easier placement. They can be purchased at Amazon or any sport store.
a puffters sport
Just had Rack and pinion replaced on my 1999 Explorer, it cost $450 which included parts and labor.
Xare is a kind of racquet sport.
Romans did chariot races for their sport
Rack and pinion power steering.
A winter sport
A non-contact sport these days