Nicholas Rolnick, The Human Performance Mechanic

Nicholas Rolnick, The Human Performance Mechanic Certified Strength and Conditioning Specialist (CSCS)
Doctor of Physical Therapy
Learning and growin

Physical Therapist
Strength and Conditioning
Personal Training
Optimizing Movement
Brookbush Institute Author
Adjunct Faculty for Concordia University-Chicago teaching Kinesiology
"The Human Performance Mechanic"

06/04/2026

I didn't realize there was a specific threshold for this.

On our latest BFR Pros episode, Dr. Tim Werner breaks down pulse wave velocity (PWV), which is basically how fast the pressure wave from a heartbeat moves through your arteries. The stiffer they are, the faster it moves, and the more cardiovascular risk climbs.

What caught my attention: there's a growing consensus that PWV above 10 m/s is linked to higher cardiovascular disease risk. And the Framingham data (Mitchell et al.) showed the top quartile, above about 12 m/s, had the highest risk of future cardiovascular events compared to everyone else in the study.

One of those numbers that quietly tells you a lot about where your cardiovascular health is heading.

Full episode on The BFR Pros YouTube: https://www.youtube.com/watch?v=0tJBL9FMhQU

06/02/2026

This is the cleanest framework I've heard for thinking about training volume. Paul Carter breaks it down: with 2 to 3 minute rest periods between sets to failure, the stimulus plateau is around 6 to 7 sets per session. Shorter rest of 90 seconds or less? Roughly double that. Two variables, one rule. I use this in my own programming and with clients.

Full episode: https://www.youtube.com/watch?v=JNth7TPorSs

06/02/2026

Loading the posterior chain, in particular the hamstrings, when you have a history of or is one of the more challenging aspects of optimizing muscular development. And in general, even if you don’t, it’s one of the more complicated movement patterns. People are very used to squatting and how the shins move with a squat, but are often challenged when they need to keep their shins relatively vertical and lean their pelvis back to load the hamstrings with a less vertical torso position.

The first exercise shown is a way we can encourage co-contraction and optimal positioning by sliding the foam roller down the leg. The foam roller can be used not only as a postural cue, but as a way to drive the arms into it while sliding down to allow for co-contraction of the abdominals which may be very important where extension load is sensitized. You can also add a small weight to begin the process of weight bearing and promote muscle growth.

The second exercise adds additional load on the hamstrings and works on some of the same concepts that tend to be limited in those with - namely a lack of pelvic dissociation. The Roman chair is a great way to load the posterior thigh, but can be a provocative movement, so it’s really important that pelvic dissociation drills and hamstring loading are done with caution to avoid a flare-up. This variation tries to encourage a maximal stretch of the posterior thigh while maintaining good positioning, then reversing it to achieve as much terminal hip extension as possible while alleviating strain on the lower back at the top position.

It’s a really nice variation, but go lighter especially if you have a history of back issues.

Any questions about what these exercises can do for you? Drop them below. 👇

06/01/2026

When to introduce forward bending (flexion) is one of the most important clinical questions in because it’s one of the most commonly affected movements. It impacts everything from tying your shoes to working out to s*x.

For me, it comes down to understanding whether the pain is mechanical, chronic, or a hybrid of both.

Mechanical pain → address movement first. Restoring motion across multiple planes: most commonly extension in my patient population, though sometimes rotation or lateral flexion before we ever load flexion. We want full range and some resiliency before attacking lumbar flexion.

Chronic pain → introduce flexion as soon as possible. When ROM is full but painful, or restricted without a clear mechanical driver, the goal shifts to reprogramming the nervous system to feel safe moving through the spine again.

Hybrid → a blend of both approaches, sequenced appropriately.

For those managing or treating lower , how and when do you introduce flexion? 👇

05/31/2026

Here’s a step by step progression to introduce extension load in and .

Strategy is simple:
1. Progressively add more spine stabilization and/or extensor range.
2. Use less mass first and add more mass later.
3. Start low reps and add more reps and sets sparingly.

These are very important (whatever you do) to introduce loaded back extension tolerance because any axial loading you do in your training will magnify the spine extensor concentric and/or isometric demands. Plus, these tend to be very sensitized so progress only with standardized rules.

05/30/2026

In Ep 4 of the podcast, I sat down with Dr. Tim Werner to talk about arterial stiffness, and one of his takeaways stopped me.

We all get stiffer arteries as we age. Inflammation, glucose, pressure, they compound over a lifetime. That part is inevitable.

What isn't inevitable is where you end up. A lifetime of exercise can rescue your arteries from that fate. Tim called exercise "indeed medicine," a very potent treatment for blunting arterial stiffness later in life.

It's the kind of framing I want more of my patients to hear. Exercise isn't just about looking better. It's vascular medicine.

Full episode: https://www.youtube.com/watch?v=0tJBL9FMhQU

05/28/2026

Here's a programming nuance most coaches miss: beginners actually need more volume than advanced lifters, and it has nothing to do with grit or work ethic. It's motor learning. Beginners can't yet sustain high-threshold motor unit recruitment, the mechanism that activates the type 2 fibers we want to grow. As they train, they become more efficient at recruiting those fibers, which is why advanced lifters need less volume to keep growing. I work through the cellular logic in Episode 5.

Full episode: https://www.youtube.com/watch?v=JNth7TPorSs

05/26/2026

I had this conversation with Dr. Tim Werner about blood pressure that genuinely changed how I think about patient assessments.

The BP cuff on your arm? That's not your real blood pressure. That's your peripheral pressure, measured at the brachial artery. Your actual blood pressure, the one your heart is working against, is central. And those two numbers are often different.

Tim's point: because most BP diagnoses are made on the peripheral reading alone, many people end up on antihypertensive medication they may not actually need, living with the side effects.

Worth watching the whole conversation.

Full episode: https://www.youtube.com/watch?v=0tJBL9FMhQU

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