Tonglen is a popular practice in Tibetan Buddhist Schools. There are several other practices like, Eight Verses of Mind Training, Generating Bodhichitta with Eq

Tonglen is a popular practice in Tibetan Buddhist Schools. There are several other practices like, Eight Verses of Mind Training, Generating Bodhichitta with Equalizing self and others. One won't find such methods in general meditation books, as these are practices specific to Mahayana Buddhism.