Just Fly Performance Podcast Podcast Por Joel Smith Just-Fly-Sports.com arte de portada

Just Fly Performance Podcast

Just Fly Performance Podcast

De: Joel Smith Just-Fly-Sports.com
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The Just Fly Performance Podcast is dedicated to all aspects of athletic performance training, with an emphasis on speed and power development. Featured on the show are coaches and experts in the spectrum of sport performance, ranging from strength and conditioning, to track and field, to sport psychology. Hosted by Joel Smith, the Just Fly Performance Podcast brings you some of the best information on modern athletic performance available.Just Fly Sports LLC Actividad Física, Dietas y Nutrición Ciencia Ejercicio y Actividad Física Higiene y Vida Saludable
Episodios
  • 509: Danny Lum on Isometrics, Elasticity, and Sprint Transfer

    509: Danny Lum on Isometrics, Elasticity, and Sprint Transfer
    Apr 2 2026
    Danny Lum is a Singaporean strength coach and sport scientist specializing in applied performance research. His work explores strength diagnostics, isometrics, and power development, and he is widely published and recognized for connecting sport science with practical coaching. In this episode, Danny explores the intersection of sport science and real-world performance. Danny shares insights from his research on isometric training, PNF stretching, and velocity-based training, emphasizing how different methods complement rather than replace one another. The conversation dives into squat depth, unilateral vs. bilateral training, and the role of variability in power development. Throughout, Danny highlights a key theme: effective training is individualized, phase-dependent, and built on understanding how the body adapts. Today’s episode is brought to you by Hammer Strength. Use the code “LILAJUSTFLY10” for 10% off any Lila Exogen wearable resistance gear. 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/) Timestamps 0:00 – Welcome to the Show 2:42 – Journey to Sprinting 5:10 – Strength Training Insights 14:38 – The Power of Isometrics 15:44 – PNF Stretching Explained 24:54 – Programming Isometrics 28:46 – Unilateral vs. Bilateral Training 36:33 – Velocity-Based Training 44:20 – The Importance of Variation 52:42 – Research on Isometric Strength 1:07:38 – Yearly Training Plan Danny Lum Quotes "When you lift heavy weights, if you have maximum intent, even though the external movement looks slow, there is rapid neural firing. It doesn't necessarily mean that slow movement during heavy lifting means you are not having a fast neural firing, which is relevant to sprinting." "For sprinters, when the knee is lifted up at the highest point, they don't just allow the leg to drop passively. They actually start developing force and hammer down right from the highest point. That is where your hip flexion angle is about 90 degrees. So if you're not strong at that position, then you're not maximizing the amount of force you can develop through the full range of movement." "If you're going to do static stretch during your warm-up, you might as well just perform isometric contraction at that position as well. That helps to not only activate your muscle, but you actually microdose isometric training every day." "You're strengthening your muscle at the long muscle length, and that long muscle length is where the muscular-tendinous system is most vulnerable. If you are not strong at that range, then your risk of injury just increases. But if you can get yourself stronger at the long range, you're actually protecting yourself." "If we are talking about loading the tissue itself...loading the muscle and tendon tissue, then doing unilateral work is probably going to benefit more because you can actually load the quads more by doing single-leg squat as compared to double-leg bilateral squat." "Having a variety of load actually gives greater adaptation. I think that why that's the case is because you allow the person to have a little bit of velocity focus and a little bit of force focus in the training." "If I contract rapidly, and I sustain for three seconds, because that allows me to build to a higher peak force, my strength actually increased more, and I also significantly increased my rate of force development. It allowed me to get the best of both worlds; both rate of force development and peak force actually improved." "Isometrics actually improved running economy more than plyometrics. My theory behind it is that runners, while they are running, is sort of like a low-intensity plyometric. So with a higher-intensity plyometric versus isometric, which is a totally new stimulus, they actually adapt more with the new stimulus as compared to plyometrics." "Today, the athlete might be able to lift 100 kilograms for five reps before he feels fatigue, and on a bad day, three reps. If I standardize in the program five reps every day, then on some days he might be overtraining, and that’s where velocity training provides the advantage. I’m still getting him to lift at his daily maximal of effort, but it’s self-regulated." "I don't really go too movement specific. Usually, I'll be more general in that sense because I prefer to build up the physical capacity rather than being overly specific. But having said that, most of the exercises have to be relevant to how they function." "Isometric training is probably the best way to improve angle-specific force generation capability. On the other hand, we also know that tissue adaptation is greater when training at longer muscle length. So you're actually stretching the muscle and the tendon a little more, and that will result in greater improvement in hypertrophy as well as greater tendon stiffness." "As they’re closer ...
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    1 h y 10 m
  • 508: Sarah Miller on Movement Archetypes and the Missing Layer of Athletic Development

    508: Sarah Miller on Movement Archetypes and the Missing Layer of Athletic Development
    Mar 26 2026
    Sarah Miller is a strength and conditioning coach at Georgia Tech Athletics, blending a background in dance, theater, and stunt performance with collegiate S&C. Her work emphasizes coordination, rhythm, and adaptable movement alongside traditional strength and power development. In this episode, Sarah Miller shares her unconventional path from dance, theater, and stunt performance into collegiate strength and conditioning, and how those roots shape her coaching philosophy. She explores how movement is deeply tied to psychology, emotion, and rhythm, challenging traditional, overly mechanical approaches to training. The conversation dives into habit, inhibition, and awareness, emphasizing the importance of freeing athletes from rigid patterns and reconnecting them with more natural, adaptable movement strategies. Today’s episode is brought to you by Hammer Strength and the Vert Trainer Use code “justfly10” for 10% off the Vert Trainer Use the code “LILAJUSTFLY10” for 10% off any Lila Exogen wearable resistance gear. For this offer, head to Lilateam.com View more podcast episodes at the podcast homepage. (https://www.just-fly-sports.com/podcast-home/) 0:00 – Introduction to Sarah 8:08 – The Art of Falling 9:40 – Movement and Psychology 13:04 – The Role of Rhythm in Performance 19:54 – Exploring Movement Patterns 25:02 – The Interplay of Mind and Body 30:51 – The Trying Self vs. Non-Trying Self 37:03 – Integrating Exploration into Training 42:45 – Movement Archetypes in Dance 51:56 – The Challenge of Bound Movement 1:02:22 – Coaching Individualized Movement 1:15:21 – The Complexity of Movement Quality Sarah Miller Quotes "If you don't have complete awareness of your own physicality, of what your body communicates, you don't know what things you're selling and how that's being read." "Psychology influences movement and what I call affective qualities of movement... even in something as basic and foundational as a squat, your mental state is going to influence your execution." "We often want to chase automaticity, but you can really become a slave to habit. There's really great freedom in being able to break from what is habitual, especially if you're unaware of what's happening in that habitual action." "If you believe that the body and mind truly are one, it's not that you just have a body that's controlled by your head or a body that influences your head... there can be an emotional reaction to doing something physical." "The trying self is just focused on achieving an end goal. Rather than being grounded in the present moment, rather than being grounded in your senses and having an awareness, you're in your head because you're thinking about something in the future. The non-trying self is entirely in the moment, grounded in the senses, aware of what it's taking in from a touch perspective, sound, and what it feels like." "I don't want you to focus on getting the rep up; I want you to focus on the process of getting there and feeling the right things." "Ideally, they're not rigid; they're expressions of movement. They give the color to movement. I do find that athletes naturally tend toward one or the other, both in their personalities and then in how they move." About Sarah Miller Sarah Miller is a strength and conditioning coach at Georgia Tech Athletics, where she works with collegiate athletes to develop speed, power, and resilient movement. She brings a unique background to coaching, having started in dance and theater before transitioning into stunt performance and strength training. Her path into S&C blends artistic movement, body awareness, and high-performance preparation, shaping an approach that values coordination, rhythm, and adaptability alongside traditional strength work. Miller’s coaching reflects a fusion of creative movement roots with applied sports performance in the collegiate setting.
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    1 h y 28 m
  • 507: Richard Burnett on Reactive Strength and Explosive Isometrics in Combine Prep

    507: Richard Burnett on Reactive Strength and Explosive Isometrics in Combine Prep
    Mar 19 2026
    Richard Burnett is a sports performance coach with experience working across high-level athletic environments, including NFL Combine preparation, where he specializes in speed and power assessment, plyometric development, and preparing athletes for elite testing and competition. In this episode, Rich Burnett digs into reactive strength testing, jump feedback, and what really matters when evaluating plyometric ability in athletes. Rich explains the differences between tools like the Just Jump mat, force plates, and Plyomat, emphasizing that context and consistency matter more than chasing perfect numbers. The conversation then moves into single-leg RSI, asymmetries, NFL Combine prep, and how reactivity profiles can reveal sprint deficiencies. Rich also shares how he uses isometrics, band-assisted jumps, and single-leg testing to build faster, more explosive athletes with greater confidence and movement efficiency. Today’s episode is brought to you by Hammer Strength. Use the code “LILAJUSTFLY10” for 10% off any Lila Exogen wearable resistance gear. 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/) Timestamps 0:00 – Introduction to Jump Testing 4:55 – Context in Performance Metrics 8:11 – The Psychology of Feedback 11:59 – Transition to Combine Training 16:10 – The Importance of Single Leg Testing 20:06 – Analyzing Reactive Strength Index (RSI) 32:02 – Asymmetry in Athletic Performance 36:24 – Gamifying the Test 44:59 – Band-Assisted Techniques 55:30 – The Power of Isometrics 1:01:51 – Single Leg Reactivity Insights 1:07:08 – Exploring the Plyomat Richard Burnett Quotes "As long as you're using a piece of tech consistently and coaching well and all the things are the same, that's really what it's all about. That's why Mike Boyle still uses the same deal from 15 years ago and will continue to use the same one because he knows what it's telling him." "The more information you start to uncover the more context you need. Whether it's inflated or not, I know like a 40-inch standing vert on the Just Jump mat is legit. And I also know a 36-inch is good. It still provided us with some key context to allow us to track improvement." "I love RSI as a teaching tool. It's fantastic because a lot of kids don't understand. It's still gluing us in to what's going on with the athlete, how their strategies are. It's helping them understand plyometrics to begin with." "It's also from a symmetry thing, really enlightening to see the difference between a left leg and a right leg when you're testing them independently. You're like, 'wow, that is a massive difference.' And let's remember the fact that this athlete has had two ACLs on this side." "Single leg ground contact time and why you do some of these single leg reactivity drills in the first place because you're dealing with mass in your whole body on one leg. Contact time being rewarded in that sense is not necessarily a bad thing at all. And we're just seeing this clear separation of some of our athletes because of their ability to be more reactive on one leg." "DRI factors in automatically what your initial jump height is. I love it because they want to self-select that. As opposed to stepping off of a box that you just maybe don't feel as confident in, self-selecting that initial jump and then rebounding just feels more confident, feels more engaging and fun for kids." "What I had seen is a really high correlation with single leg max RSI and sprint ability in athletes. Higher than force plate jumps, higher than pretty much anything else." "The step further is now the cyclical five hop where I'm having to really tolerate all of this landing force from my own jump height that I'm creating on the single leg five hop RSI. That's the one that I'm wanting to really flesh out even more to know who's lacking reactivity." "The sprinting is enough for them to get that midfoot forefoot work but there's no real need to specify some sort of plyo around that when they're sprinting already and we sprint so much." About Richard Burnett Richard Burnett is a sports performance coach and the creator of Plyomat, an innovative training system designed to enhance plyometric development, coordination, and reactive strength across a wide range of athletes. With a coaching approach rooted in movement quality and progressive overload, Burnett has built a reputation for blending traditional jump training principles with creative, constraint-based environments that challenge timing, rhythm, and elastic output. His work emphasizes not just how high or far an athlete can jump, but how efficiently they can organize force, absorb impact, and transition between movements. Through Plyomat, Burnett has introduced a practical framework for integrating plyometrics into both high-performance and general athletic settings, offering ...
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    1 h y 9 m
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