I have the Book COOL IMPOSSIBLE.  I just cannot thank Eric for the foot strength exercises, especially, the Slant board.  I started  running at the age of 58 with some seriousness. I felt very awkward to be in the Group where the Team had to wait for me to catch up with them. In fact I was dragging the team.  Slant board for 2 months as mentioned in the Book and Lo!  the position had reversed- Literally.  The ease, the push and the style- all too impressive for the inconspicuous & easily dismissed "little" exercises.   Thanks Eric once again.   

I do not need to over emphasize the benefits.  Check it out yourselves.