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9 contributions to Ruth Performance Lab
Coaching Conversations EP9 - Why Can't Athletes Sleep Before a Competition?
"Relaxing is a skill just as much as a ring muscle-up is. And if you want to be good at it, you have to practice it on a consistent basis." Almost every conditioning workout I write ends with box breathing for exactly this reason. Athletes who never practice calming down in training can't find the switch between events, and the night before a comp turns into a 2 AM replay of event three. The rest of it: - what to review when you wake up at 2 AM, instead of the heat sheet - the breath counting drill I put in warm-ups (and the running version from Brent Fikowski) - why most CrossFitters panic in the pool, and what CO2 has to do with your metcons - Ryne's case for a hobby that has nothing to do with CrossFit - what the best athletes count as a failed skill session - what a 2026 review found when it compared ice baths and compression to doing nothing Full episode: https://open.spotify.com/episode/5UMwSH8KkrTuK6dO1qeupG Written recap with every study linked: https://kyleruthcoaching.com/fieldnotes/cant-sleep-before-competition Corrections: the recovery review we mentioned is Jin et al. 2026 in Frontiers, not a Steve Magness paper. And the CO2 therapy results from Breath on air were a reduction not elimination of panic attacks; the recap has what the book actually reports. Questions and pushback in the comments. If there is a topic you want us to cover, put it here.
1 like • 10d
Great podcast, Kyle! Really enjoyed this one. My main takeaway was that simplicity is normally the best approach to programming, ensuring you are treating relaxation as much as part of your programming than the actual training (i.e Box Breathing after conditioning) and protecting it as much as possible, start doing “white-belt” activity / finding new hobbies outside of CrossFit / fitness, and our expectations can drive results as much as the training modalities. The Expectation Effect really was a great book and hope others read it!
Looking for feedback on a nutrition guide
Hey everyone! I put together a nutrition guide for competitive functional fitness athletes covering hydration, intra-workout fueling, and carb cycling. Before I finalize it I want a few sets of eyes on it. Looking for 2 - 3 people willing to read through it and give honest feedback on: - Content - does anything feel off, missing, or unclear? - Design / readability - is it easy to follow, do the tables and layout make sense? - As an athlete or coach, would you find this useful? It's about a 15-20 min read. Drop a comment if you're down and I'll send it over. Thanks!
1 like • Apr 25
I am happy to also look through it.
BFR Training
Hi! I know you’re a huge proponent of BFR training and its benefits. Curious if you think all BFR cuffs are created equally? Do you have a specific brand you would recommend?
3 likes • Apr 4
Hi Rikki, I can actually answer this question. All BFR cuffs are not created equally. The first thing you should know is there are 2 types of cuffs: Pneumatic and non-pneumatic. For the sake of this comment, I will only focus on pneumatic cuffs. Pneumatic cuffs use air to inflate the cuffs. It allows for the potential for more consistent application of applied pressure due to the capacity to monitor vis a sphygmomanometer or other means. It is further divided into multi-chambered and single-chambered cuffs. 1. Multi-chambered cuffs Multi-chambered cuffs are sequential air bladders that allow for some limb expansion underneath the cuff, thus reducing the magnitude of pressure that can be applied. It is less fatiguing compared to single-chambered devices. By using a multi-chambered cuff, one cannot personalise pressures. For example, this study found 350 mmHg was the first pressure noted in one study to reduce resting arterial blood flow, whereas it was around 81 mmHg in a single-chambered cuff when both cuffs had the same cuff width. These are often marketed for comfort and safety, but alas, BFR is only as good as the pressure applied. 2. Single-chambered cuffs Single-chambered cuffs are the most widely used in research and have one continuous bladder for uniform pressure application. They can fully restrict both arterial and venous blood flow. These cuffs can either be autoregulated, non-autoregulated, or manual. --> Autoregulated BFR cuffs Autoregulated BFR cuffs just means the pressure is adjusted intra-exercise. It attempts to compensate for limb swelling and movement. The speed of autoregulation is likely a significant factor in the effectiveness of the stimulus and is frequently used in physical therapy, clinical, and high-risk populations. These are typically exceptionally more costly than non-autoregulated BFR cuffs. Devices include: - Delfi Personalized Tourniquet Device - this is the most researched autoregulated device on the market. And as such, it is priced as the most researched autoregulators on the market. (Price normally goes >$5,000) - MadUp - This is a bilateral design with moderate cuff width. From what I know, it is used in one study so far. It is also priced >$7,000 - KAATSU - these are narrow (3-5cm wide) cuffs. There are a lot of research published using a variety of KAATSU models as well. They run b/t $1259-1299. Dr. Rolnick (previous mentor and leader in BFR) uses these quite often when chilling at home.
Gabbett & Oetter (2024) – From Tissue to System: What Constitutes an Appropriate Response to Loading?
While it’s not entirely CrossFit related (or is it??), I thought this article was a great read as I am studying for the CSCS. It gave a good overview of understanding what is "optimal" loading in terms of tissue, cartilage, bone, and normal muscle adaptations. The synopsis I got from this: • Load response is non-uniform, tissue-dependent, and time-sensitive (i.e cartilage requires around 15-30 min for recovery, bone 4-8 hours b/t stimuli, tendons around 48 hours, muscle (eccentric focused) around 72 hours, and so on) • Optimal training requires understanding what tissue is limiting and adjusting sequence, spacing, and recovery. For many of my clients who have some sort of joint pain (typically elbow, shoulder, and/or knees), I can see the utility in this paper to help guide some programming. Isometric holds and slow eccentrics tend to do very well in tissue remodeling and strengthening of bones and muscle tissue. I like how they also give An athlete monitoring framework to help guide external loading, internal loading, measures of well-being, and measures of physical readiness.
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Coaches: Dealing with sick athletes?
I along with a number of my athletes are dealing with the classic winter respiratory infections. I’m curious how help your athletes navigate these?
1 like • Dec '25
Most of my clients tend to prefer to fend for themselves, but if i were to help them: 1. Ensure training volume and intensity is lower, as it can make recovery worse with more volume and training. Auto-regulate training as needed. 2. Consider supplementing with L. fermentum (PCC®), L. casei Shirota, B. animalis BI-04 (varied CFUs) as these are associated with decreased URTI severity and duration 3. Drink water 4. Sleep - Rest should be a non-negotiable 5. Sauna
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Jonathan Miller
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8 points to level up
@jonathan-miller-7787
Test. Train. Thrive.

Active 10h ago
Joined Nov 24, 2025
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