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Mike,
One of the companies was Second Sole. Rick Hurtz turned his
dad's shoe repair business into a running shoe store
franchise.
What many people still do is get a glue gun and level out
the worn area with the glue. Sometimes is lasts for a long
time and needs rebuilding more frequently.
If it's the outside of the back of the heel that is wearing
out fast, it tells me that you overstride and are wearing
the back of the heel out way before the life expectancy of
the whole shoe.
Some exercises to stop the overstride are to: Put the foot
down faster
Take smaller quicker steps to diminish the foot swinging out
in front and landing on the back of the heel of the shoe.
March in place lifting only the knees and then practice
running in place only lifting the knees so that you get a
sense of landing flat footed( also called midfoot or
ball/heel)
If you practice the running in place lifting the knees
only an inch or two, and you begin to lean from the ankle
with an erect posture (remember the lean is from the
ankle) you'll find that you're still doing the running in
place and everytime you put y our foot dow you're several
inches ahead.