Premanand Maharaj Ji
How can I build concentration for meditation?
Pranayam, trataka and naam jap
Do a little exercise and 15 minutes of pranayam (breath control), then gaze at one point for 10 minutes while chanting inside. Concentration is a wealth that comes through spiritual life.
Keep your gaze on any one point for 10 minutes without moving away, chanting Radha Radha inside, and your concentration will grow strong.