There are countless exercises circulating on the internet, none of them reliable, none of them grounded in the scriptures, and none of them that can produce lasting, penetrating results.

The tendency to dabble in unverified, questionable sources is a serious problem for neophytes. Also, to mix practices from this tradition with other things dilutes or inhibits the intended results of the original practice. Instead of dabbling with questionable sources on the internet, it is better to investigate things seriously, to study and compare, and to follow your intuition and an informed eye through developing intellectual spiritual culture.

You might find the following resources helpful:

The Chakras (lecture)
The Chakras (pdf)