There are so many ways to practice formal mettā (loving kindness) meditation, and they all benefit from a relaxed mind and body. The proximal cause for samadhi (concentration) to arise is from a deepening sense of happiness, calm, and contentment. Many practitioners are drawn to use will and force to concentrate their attention, and this leads to agitation, frustration, and fatigue. With mettā breathing and body awareness we can cultivate the ease so useful for our hindrances to subside.