Chen Taijiquan patterned tuishou, in this case Dalun, is a most useful training method for clear development of JIN. These days this facet of traditional Chen Taijiquan training is sorely neglected and often just seen as a cursory circle to begin a competitive wrestling bout. In fact this practice is where many of the gems of structure and technique are found. Here are some views on very basic training.
Chen Taijiquan Boston Tuishou Class Excerpts 2014 陈氏太极拳推手