Common Sense Evaluation

Is this struggle for mobility
An exercise in futility?

Either level or somewhat inclined
With progress feedback I am designed

Whether you choose to walk or to run
You always end up where you’ve begun
 

Tests of time I’ve had to face,
My strength and my endurance
Cause of weakness; it’s your race,
But I’m free of all life currents.

Was I a calendar, a tomb, a shrine?
We’ve all wondered it before.
We don’t know… but I’m a wonder!
I can tell you that for sure.
 

I do not smell very well
But at least I have many eyes.
I have two tongues but never yell
And I’ll bet you know my size.