The good: The shoes look great, they are durable and of good quality. I use them during my gym and HIIT workouts. The not so good: The shoe is quite stiff. There are exercises during HIIT when it becomes uncomfortable because of its high levels of stiffness. Moreover, you definitely cannot run on these, not even short bursts of sprints for HYROX for example. Short walks are fine but anything more than 2,000 steps and it becomes uncomfortable. Perhaps they fixed these issues on gen 4…