hi guys i am a total noob to bikes and everything.
got a few questions hope you guys can help me out
1. on youtube i type in mountain biking or xc it always shows those high speed down hill video, is there any decent demonstration of xc or any non-downhill mountain biking?

2. ive also seen some videos from danny macaskill and i noticed (if not mistaken) his bikes dont have any suspension and his doing all those jump and drop. Why do we need suspension to be so good on mountain bikes?