There are five factors that are supported for deepening concentration, known as the jhana factors. These factors are developed in any kind of intensive meditation practice, but are particularly supportive for the development of samadhi. They also serve to counterbalance the hindrances. When the hindrances are not active, the mind and heart can be buoyant and open, allowing concentration and insight to deepen.
Guided Mudita meditation spreading out our consciousness offered "appreciative joy" first to oneself, then to someone our relationship is easy with, then a "neutral" relationship, then to all beings everywhere.