The next progression from Inside / Outside Touches (1foot) is using both feet and alternating. Here are some key points:

• Zig zags can be nice and wide.
• Sequence is inside right foot,  outside left foot, inside left foot, outside right foot, repeat.
• Good athletic positioning.
• Focus on quantity of touches, not speed.

Be sure to watch the slow motion portion of the video to fully understand the sequence.