I have been running in various models of the Adrenaline for years now. They are a staple amongst all the runners I coach. Their performance level as a consistent, solid training shoe is undeniable. For a stabilizing "trainer" their sole has a great deal of flexibility. I suffer from plantar fascitis and having a flexible sole is extremely important. The double EE width is also a big plus (it means I don't have to doctor my shoes to accommodate some pesky bunions). A great shoe for runners of all ages.