In so far as qi gong exercises such as the microcosmic orbit can be used to promote kundalini awakening, yes. The Chinese system aims to cycle the energy rather than just raise it however.
You can pretty much do yoga anywhere you wish. Most places recommend a mat, regardless of what the floor is covered with.
And if you are doing moves that require you to slide parts of your body...
Only when you want to meditate Answer You can increase your flexibility if you do it more often--BUT be sure to crosstrain, that is, to vary your routine so that you do not cause injury due to...