1 Minute gestures (special tool)

Done as part of a practice session with poses of 60 seconds in length with my Atcatel tablet on Autodesk Sketchbook.

After a few gestures I decided to use a particular tool that will help me achieve more fluid strokes and better proportions.  Can you guess which ones I use this tool and what I used?

My current goal is: Improve at correctly capturing the overall proportions of the human form