Today’s guest is Aaron Uthoff. Aaron Uthoff, PhD, is a sport scientist and coach whose work sits right at the intersection of biomechanics, motor learning, and sprint performance. His research digs into acceleration, force application, and some less conventional forms of locomotion, including backward sprinting, with the goal of connecting solid science to what actually works on the field, track, or in rehab. Backward running shows up all the time in warm-ups and general prep. Most of the time, though, it’s thrown in casually, without much thought about what it might actually be doing for speed, coordination, or tissue loading. In this episode, Aaron walks through his path into performance science, which is anything but linear. From skiing in Montana and playing desert sports, to football and track, to a stretch training horses in Australia, his journey eventually led him to research mentors in Arizona, Scotland, and New Zealand. That broad background shows up clearly in how he thinks about movement. One of the big takeaways from our conversation is Aaron’s overview of research showing that structured backward running programs can improve forward acceleration and even jumping ability. We also get into how backward running can be used as a screening and coordination tool, and where it fits into rehabilitation, including what’s happening at the joints, how muscles are working, and how to progress it without forcing things. We finish by digging into wearable resistance, including asymmetrical loading, and why this emerging tool may have more upside for speed and movement development than most people realize. Today’s episode is brought to you by Hammer Strength and Lila Exogen. Use the code “justfly20” for 20% off any Lila Exogen wearable resistance training, including the popular Exogen Calf Sleeves. For this offer, head to Lilateam.com Use code “justfly10” for 10% off the Vert Trainer View more podcast episodes at the podcast homepage. (https://www.just-fly-sports.com/podcast-home/) Topics 0:00 – Aaron’s background and coaching lens 6:40 – Seeing movement through posture and orientation 13:25 – Why breathing changes how athletes move 20:45 – Tempo, rhythm, and shaping better movement 30:10 – Constraints based coaching and problem-solving 40:55 – Sprint mechanics without over cueing 51:20 – Using environment to guide adaptation 1:01:30 – Blending strength work with movement quality 1:12:15 – Coaching intuition, feedback, and learning to see Quotes from Aaron Uthoff "Backwards running is about 70 % of the speed of forward. 60 to 70 % of the speed of forwards running. So whatever your maximum speed forward is about 70 % of that backwards for somebody who's been doing it for a little while. So just there tells you that there's not going to be the same magnitude of force as there is with a forward sprint." "If you've got anterior knee pain, which happens with lot of plyometrics, jumping, you think a lot of court-based sports, jumping track-based sports, things like that, you can simply reduce their patellofemoral joint loading by having them go backwards." "What we see that I love preferentially is that we actually get really high hamstring activation concentrically, which is not the case with forwards running." "I've got an injured athlete who had a hamstring injury and just wasn't able to decelerate his shank when he was sprinting forwards. So I had him run backwards. And what that's done is that's trained his hamstring concentrically to basically contract really, really quickly without putting that undue eccentric stress onto the joint on the muscles." "I think it's a good screening tool to see, well, where are they at from a coordination proprioceptive perspective? And you might have somebody that's super duper fast going forwards, but you know, if they actually can apply that skill, then you know, their proprioception is likely off a little bit." "By removing that vision... you're just having to tap into a different system a little bit more. And I find that that's one of the things that allows athletes to really expand their skillset majorly. "Backside mechanics plays a large role in the elasticity that's going to happen and the power that you're to be able to deliver on the front side of the body. And if you shorten that up or you're inefficient or uncomfortable in that space, then you know, backwards running is a really cool way to learn how to do that in a way that is a little bit safer at a slightly lower speed where it's a new drill." "I want you to be racing your belly, basically your belly button and your chest are going to be racing to the finish line. But unlike forward running, I want your belly button just to slightly win. And that just puts them into a posture that allows them to have that, that slightly lean, but still be upright." "Another thing I really like is I want them to stack their hips, basically their ribcages on top of their hips. They've got nice intra-abdominal pressure to allow that elastic recoil to happen through the core." "I think there's a lot more spinal engine utilized intensively with a backwards run than we might realize. And that's one of the major things I'm seeing. So we integrate a lot of spinal engine work into our drills just to help with the ability to carry that in. "If you actively, concentrically contract the hamstring and try to kick that heel out back behind you, and use that as a leading mechanism, then that allows your hip flexor to act concentrically more powerfully as well as it comes down. So you're able to train the anterior side of the thigh much more exclusively." About Aaron Uthoff Aaron Uthoff, PhD, is a sport scientist, researcher, and coach focused on human movement, sprint mechanics, and motor learning. He holds a doctorate in kinesiology, with research centered on how neuromuscular factors influence speed, coordination, and efficiency. He is especially known for his work on acceleration, sprinting, and unconventional locomotor strategies such as backward running, and how these methods affect force application, tissue stress, and motor control. His work blends strong scientific foundations with practical coaching insight, making it highly relevant for track and field, team sports, and rehabilitation environments. Alongside his research, Aaron works closely with coaches and athletes to translate complex biomechanical and neurological ideas into simple, usable training concepts. His approach values curiosity, experimentation, and respecting how the body naturally adapts when it’s exposed to new movement challenges.
