The use of stationary exercise bicycles in a group is usually referred to as Spinning.
a turntable
stationary clot is called a thrombus or a blood clot.
Track cycling is done in a velodrome.
Parallax
As with so many words, this comes to us because we prefer a shorter word to a longer. "Cycling" is a shortened version of "bicycling".
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Cycling
Origin
A stationary object used to gauge the movement of another object might be called the reference. This could also be termed as the point of reference.
It can be.
A person who sells pencils and inkpots is called a stationery vendor or a stationary supply retailer.
Performances are Typically called recitals. One Competition is called Feis. Many Competitions are called Feisanna. A group Dance is called a Ceili.