I do Jazzercize 5-6 times each week and RYKA Shoes are sold in my studio at a slight discount! So, I have purchased about 4 pair over the past 4-5 years and have worn them exclusively during that time. I love the ankle support which helps with lateral moves. I also love the look and the fact that they are very light. What I did not realize all of this time is that the slipping I was experiencing while exercising  was not normal. What a duh moment right!? As I said, I have been wearing RYKAs exclusively and thought that everyone shared my experience! Not so! I just bought a pair of Nikes! What a difference! Not only in the slippage but also in the arch support. When I wore my new shoes to class for the 1st time I got plenty of compliments but also comments about RYKAs and how they slip on the floor. Wish someone had said something sooner! Live and learn right ... I am Good to go now!