French Alps - Where should i go

Sorry if there is a duplicate thread.
I will be heading to French Alps in Sept for a long weekend holiday. My hotel is located in a city called Grenoble and I would like to do some downhill riding similair trails as Glentress.
Could anybody advise me where should I go and is there a website with a relevant information.for my research.
Thanks
I will be heading to French Alps in Sept for a long weekend holiday. My hotel is located in a city called Grenoble and I would like to do some downhill riding similair trails as Glentress.
Could anybody advise me where should I go and is there a website with a relevant information.for my research.
Thanks
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Pretty obvious answer. I have googled for it and getting a lot of information (too much for me to digest). I am more looking for recommendation from people who went there.
http://philippe.bouvier1.free.fr/vtt.php