I was driving back to the office and noticed a lady running down the sidewalk. We often talk about somebody being a heelstriker, a mid-foot striker, or ball of the foot striker, but she was actually a heel striking on her right foot and ball-of-foot striking on her left foot. She was actually so biased towards her toes on the left that often her heel never reached the ground.

Has anybody else seen something like this? Have you seen it in somebody that you considered fast? Would you conceivably use two different shoes designed for two different strides?