Any of the exercises that you start out with will get the kundalini moving. You don't have to stay with them for the entire period of meditation.
You can just sweep the floor generally and gain nothing from it. Or you can figure out the best way to sweep the floor, put your power into it, use it as a concentration exercise, and be meditative.
Computer science is fascinating. As you study computer science, you will find that you develop your mind. It is literally like doing Buddhist exercises all day long.
The logical and extralogical exercises you do in meditation are very similar to advanced systems analysis and programming.
I have yet to see a career that is similar in benefit as computer science for doing the advanced exercises.
During the time of Atlantis, members of the Mystery Schools discovered and developed specific concentration exercises that they found would radically increase and sharpen their innate psychic abilities.
The mantra is a very preliminary exercise for the student to begin to grasp a sense of focus. When they are used by persons who have reached very high levels of attention, they can open up doorways to other worlds.
People can insert thoughts into your mind. This is more dangerous for psychic people. Use concentration exercises and read to combat this; boredom is an easy way to be drained.
Practice mediation and concentration exercises, and begin to think more about regaining your sensitivity by avoiding draining situations. Not because of fear but because of intelligence.
Learn to control your emotions. Be able to glide through them. By practicing concentration exercises and meditation, you will find that when strong emotions strike, you will gain the ability to not be swayed by them.