Recitation of Hanuman Chalisa daily will ward off sani bhagavan. Hanuman gave difficulties when sani caught him. He took sani and flew to the extreme height and sani was frightened. Sani caught hanuman's leg and the latter ran in the land full of stones throns etc. Sani was bleeding and told Hanuman that whoever recites your chalisa I will not catch him. Such is the power of Vayu putra.