The second part of the session was aimed at chewing gum. Apparently, part of the reason some of the sounds my son cannot articulate well, come from having a weak tongue and lips. His homework this week is to chew gum on the left side for 30 seconds then using only his tongue move the gum to the right side of his mouth for 30 seconds. After that he is to practice moving the gum from side to side using only his tongue. We are also supposed to practice everything we went over in lesson one.
Other resources I found
The Tongue Story