KRU PT + Performance Lab

03/16/2026

Achilles Tendinopathy Rehab for HYROX & Runners
Your Achilles takes a huge amount of load when you’re running, lunging, jumping, and pushing sleds. If the tendon’s capacity can’t keep up with the load, pain starts to show up.
Two exercises used all the time to rebuild Achilles capacity:
1️⃣ Isometric Calf Holds (Progressive Positions)
Isometrics are great early on because they load the tendon while helping reduce pain.
Prescription:
• 4–5 sets
• 30–45 second holds
• 1–2x per day
Progression:
• Plantarflexion (heel elevated): least compression, best starting point when symptoms are more irritable
• Neutral: increases tendon loading as tolerance improves
• Dorsiflexion: highest demand and compression — use later in rehab when the tendon is stronger
The goal is gradually increasing tendon load without aggravating symptoms.
2️⃣ Slow Eccentric Heel Drops
The Achilles tendon is formed from two calf muscles — the gastrocnemius and the soleus. Your knee position determines which one you’re targeting.
Prescription:
• 3–4 sets
• 10–12 slow reps
• 3–4 second lowering phase
Variations:
• Straight knee: biases the gastrocnemius
• Bent knee: biases the soleus

Both muscles feed into the Achilles tendon, so training both helps improve the tendon’s ability to tolerate load during running and hybrid training.
Simple exercises. Done consistently. Big difference in building Achilles resilience.

03/12/2026

Graston Technique is a tool physical therapists use to improve how muscles, tendons, and fascia move.
Using specialized instruments, clinicians apply controlled mechanical stimulation to soft tissue. Research suggests this may increase circulation, stimulate tissue repair processes, and improve movement tolerance.
In rehab, it’s most effective when combined with strength training and progressive loading to restore healthy movement.
Swipe through to learn how it works.

03/10/2026

Grip strength quietly dictates performance in HYROX.

When the hands and forearms fatigue, the rest of the system follows — affecting carries, sled work, and pacing.

Build grip capacity early so it’s not the weak link on race day.

03/09/2026

Graston Technique helps break down restrictions in muscle and fascia, improving mobility and restoring normal movement patterns.

By restoring tissue mobility, we help athletes move more efficiently, reduce irritation, and get back to training with fewer limitations. Tight tissue doesn’t just feel stiff — it changes how your body moves.

03/02/2026

Grip fatigue isn’t just “forearms burning” — it’s your output getting capped.

If your hands gas out, your strength, control, and quality reps drop with it.

Train the connection as hard as the movement.
Save this for your next grip day.

02/26/2026

Your feet absorb thousands of pounds of force every run.
If they aren’t strong or mobile enough to handle it, something else will.

Foot fitness improves:
✓ Push-off efficiency
✓ Shock absorption
✓ Load tolerance
✓ Long-term injury resilience

Performance starts from the ground up.

02/24/2026

Most marathon injuries don’t happen on race day.
They’re built quietly in training, when load stacks faster than your tissues can adapt.

Here’s the simple equation:
Load > Capacity = injury risk goes up.

Race day is often the “safest” day because you’re tapered, rested, and fueled. Peak training weeks are where most runners get into trouble: higher mileage, back-to-back long efforts, added intensity, and not enough recovery.
If you want to stay healthy through marathon prep:
• Build tissue capacity with strength training 2–3x/week
• Progress training stress gradually
• Plan deload weeks so your body can actually adapt

Strong runners last. Durable runners finish.

02/24/2026

Most marathon injuries don’t happen on race day.
They’re built in training when load outpaces tissue capacity.

Race day is often the safest day because you’re tapered and rested, but peak weeks are where problems show up.

Stay healthy by building capacity: strength train 2–3x/week, progress gradually, and plan deload weeks.

02/20/2026

Position before power.
The LightBack reinforces spinal alignment and posterior chain control — because performance built on compensation doesn’t last.

02/17/2026

Research shows athletes who return to cutting and pivoting sports before 9 months after ACL reconstruction have up to a 7× higher risk of a new ACL injury.

Even more important — many athletes who re-injure actually passed symmetry and hop testing.

Why? Because strength symmetry ≠ sport readiness.
A safe return to sport depends on:

• biological graft healing
• adequate quadriceps strength
• force production & deceleration control
• progressive exposure to sport demands

Clearance is a moment.

Readiness is a process.

At KRU, return-to-sport is criteria-based — not timeline-based.

If you’re coming back from an ACL injury, the goal isn’t just to play again.

It’s to stay playing.

kneerehab

02/16/2026

02/13/2026

For sprinters, “strong hamstrings” is about matching eccentric (lengthening) capacity to the force demands at each sprint phase:
🔺 Proximal eccentrics to support hip acceleration mechanics
🔺 Distal eccentrics to tolerate high-speed knee recovery
🔺 Long-length strength to bridge both

Injury prevention for sprinting starts once you align isolated hamstring capacity to actual sprint-phase mechanics. Most hamstring strains occur during high-speed running, preparation must reflect those mechanical demands .

The hamstrings are biarticular — meaning they cross the hip and the knee — and their mechanical demands shift across phases of the sprint cycle (Acceleration to Max Speed).

▶️Acceleration - early phase
🔺Backside hip extension demands are high through the glutes and hamstring for propulsion
🔺Eccentric strength at the proximal end (closer to the glute) helps the athlete tolerate large hip flexion moments while transitioning from swing back into stance.

▶️Max velocity - top speed phase
🔺This is the phase most commonly associated with hamstring strain occurrence.
🔺The distal hamstring (closer to the knee) experiences high eccentric load in late swing as it decelerates knee extension just before foot strike.
🔺Distal-focused eccentric capacity helps the athlete manage the rapid lengthening that occurs at high limb speeds during knee recovery

▶️Why eccentric specifically?
🔺Most sprint-related hamstring strains occur during terminal swing, when the muscle is lengthening under high load (Alonso et al., World Athletics injury surveillance data).
🔺Eccentric training increases fascicle length, improves force production at extended muscle lengths, and enhances the muscle-tendon unit’s ability to absorb energy — all critical for sprinting.