This has been the primary technique used with my DD. Instructor did some side toss and worked on some setup stuff. The got very hands on and held the bat showing her the path to bring it through...then lots of half distance underhand lobs. Bucket after bucket, blisters upon blisters, to begin. Now she is moving back another step or two and windmilling some to her. It is coming along well, and dd is growing in confidence. Drilling balls into that screen has a crazy sense of accomplishment!