What is the difference between a good track and a bad rubber

Hi,

I hear people at meets say "that is a bad track" and "that is a great track" but I don't really understand what they mean.

One time we were at a relatively new rubber track (that I thought was good) and I heard one guy say it's a bad track.

What makes a rubber track good or bad?

Is it because of how the track is shaped? Or maybe the material?


Please help.



Thanks!



I didn't find the right solution from the Internet.



References:

www.letsrun.com/forum/flat_read.php?thread=8609382

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