To move away from breath based exercises for awhile: here is a meditation loosely based upon a meditation from the yogic traditions that has the potential of leading to rather profound results.
Take a few moments to relax and allow your breathing to become calm and regular, but don’t really focus upon it.
After you’ve allowed some space from the immediate concerns of life, focus upon your foot with as much mental clarity as possible, but certainly don’t allow frustration to develop over lack of absolute clarity. Once the idea of your foot occupies your mind, mentally say to yourself: “This foot is not me. If I was without this foot I would still be me. What then am I?” During the final part of this mental statement, imagine that your foot disappears. Repeat this sequence with each area of the body: the other foot, the calves, the thighs, etc., up to and including the head, face and brain.
What is “I” in absence of the brain. . . . . ?
What insights arise from this exercise after a few weeks of daily practice?