This shoe works well in the context of general strength training and for strength work programmed in WODs, but it will have some limitations, and that’s typical for cross-training shoes rooted in versatility. One of the worst things about CrossFit shoes is that they truly suck for running more than about a mile in a session. Since the Reebok Nano X3 has a lower-profile upper that hugs the foot a little more, I think most lifters and athletes will want to go true to size in the Nano X3.

Nano X3 | Gym Shoes | Reebok Official UK

A.R chassis is essentially designed to give you more responsiveness through the heel when jumping and running, then compress and stabilize as you lift. Since there’s an arc on the Assault Runner my heel does strike a tad more with my long strides and I felt like I got a little more “pop” in the X3 compared to the prior Nanos. They are cushioned yet firm, have great floor grip and will give you a solid platform for whatever your workout is. As stated earlier, shoes designed for in-gym training feature less cushioning than dedicated running sneakers and are more rigid by nature.Plus, it's common to find gym shoes with a flatter outsole construction, harkening back to the desired ground contact you want for most heavy lifts. When it comes to more varied training days, or sessions where CrossFit is the name of the game, I thoroughly prefer the latest Reebok iteration over any other competing silhouette. This has always been the goal of CrossFit shoes, but as you might expect, designing a shoe that excels at multiple (vastly different) activities is an arduous task. That being said, this is also a construction feature I’m going to keep an eye on as I test this model more. Chassis System” and it supposedly supports both running and lifting better than any other shoe available today.

Nano | Nano X3 | Reebok Official UK Nano | Nano X3 | Reebok Official UK

Another drawback that I could see some having with the Nano X3 is that it’s likely not going to align with athletes and lifters that love minimalist-feeling training shoes. To discuss the performance of the Reebok Nano X3, I tried to take these shoes through a wide range of workouts. This model is a stronger performer in pretty much every vertical than the Nano X2 and seems to have good durability. Another aspect to like about the Nano X3 and CrossFit is that it seems like Reebok finally fixed the rope climbing durability issue that the last two models suffered from.For your typical Zumba or yoga class, they are breathable enough to not sweat like crazy, and are comfortable enough to last the session with enjoyment. The Reebok Nano X2 is a great shoe for the general fitness enthusiast who likes to do a little bit of everything. Thankfully, though, the Nano X3s do offer an extra eyelet that allows for a lace lock setup — provided you know how to tie one in.

Reebok Official UK | Reebok Official UK

Minimal running in the gym they worked okay but I did run a 5k in them to get a real running experience and it’s just not what they are made for.

The final drawback that I have with the Nano X3 is that its sole can run a little stiff out of the box and the upper folds a bit at the bottom of the toe box.