Shoulder & Knee Health Volleyball Clinic | Powercore 360

Power Hitting Clinic · Ages 12 to 17

40% of volleyball players will have shoulder pain.
20% of volleyball players will have knee pain.

More practice means more risk, and the pain can follow athletes for years after they stop playing. We teach them to hit and land with the whole body, so the shoulders and knees stop taking the beating.

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Founded by a spine-center training director

Physical therapists on staff

1:8 coaching onsite, 1:4 online

What the Research Shows

Shoulder and Knee Pain Are Common.
They Aren't Random.

Frisch et al., 2017: 40% of female high school volleyball players reported nontraumatic shoulder pain; 33% of them took time off

Forthomme et al., 2013: prior shoulder pain meant nine times higher risk; eccentric rotator strength was protective

Boden et al., 2000: 72% of ACL injuries were non-contact, mostly during a sharp deceleration or landing

Tap a study to see it full size.

Pain that comes and goes is usually a mechanics problem, not bad luck.

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Why It Happens

One Root Cause.
Two Joints That Pay for It.

Shoulder and knee pain usually share a cause: one joint doing a job the whole body should share. Our training teaches the whole body to create force on the way up and absorb it on the way down.

On the way up

The Shoulder

Arm-only swing

HipsTrunkShoulderArm

The shoulder makes the speed and takes the load on every swing.

Full-chain swing

HipsTrunkShoulderArm

The legs and hips make the speed. Trunk rotation shares the load.

What we teach

Hip turn and trunk rotation
Rotator cuff and eccentric strength work

Research identifies eccentric rotator cuff strength as a protective factor (Fayão et al., 2024).

On the way down

The Knee

Stiff landing

AnklesKneesHipsTrunk

Straight knees and an upright trunk, so the knee absorbs the force.

Controlled landing

AnklesKneesHipsTrunk

Ankles, knees, and hips bend together and share the force.

What we teach

Safe landing coaching with 1:8 feedback
Jump mechanics and load education

Individual landing feedback improved landing mechanics in 12 to 14 year old girls, and it held 4 weeks later (Parsons & Alexander, 2012).

These are the mechanics researchers link to healthier shoulders and knees.

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Billy Glisan, Powercore 360 CEO and Founder

Who We Are

Powercore 360
CEO & Founder, Billy Glisan

National Director of Training for 12 rehabilitation centers at the nation's largest spine center.

Published author on spine and back care, including contributing author of Back In Shape and the consumer guide 50 Ways To Reduce Back Pain.

Injury prevention consultant to Fortune 500 companies including General Motors, Shell, ExxonMobil, Texas Instruments, and Target.

Power hitting and strength consultant for Division I, II, and junior college volleyball programs.

Over 20 years training club, collegiate, Olympic, and professional athletes.

Your Athlete's Coaches

PC360 coaches include former collegiate players, physical therapists, and strength and conditioning coaches, all trained in the PC360 method.

Real Results

Families and Clinicians
See the Difference

PT & Daughter

Aubrey Packer

"My shoulder pain has completely gone away."

Pro Volleyball Player

Nicole Edelman

"If you're not using your whole body to hit, you're setting yourself up for injury."

Amazed Mother

Brooke Robbins

"I'm seriously in shock right now. I cannot believe the difference in 20 or 30 minutes."

Division I Hitter

Emma Ammerman

"I saw dramatic changes in my game. You can actually feel your body moving differently."

Hall of Fame Coach

Terry Pettit

"Powercore 360 is the best tool I know of for teaching an athlete the power to serve and spike a volleyball."

Pro Player & Coach

Ryan Ammerman & Jim Merit

"It's been amazing to see the results in just one session."

Proven Track Record

Our athletes have gone on to play at these schools

College logos: Nebraska, Florida, Texas, Penn State, Stanford, Notre Dame, Washington, Ohio State, Arizona, Duke, Oklahoma, UCLA, Oregon and more

Bonus: They'll Hit Harder

Up to 75%

Lower peak shoulder load when the trunk rotates with the arm

Protecting the shoulder and hitting harder aren't a trade-off. Research modeling the volleyball spike found that rotating the trunk with the arm cut peak shoulder load by up to 75%, while arm speed came from the legs and hips.

Gupta et al., 2021, Life

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Proud Father

"She went from not even hitting 25mph to hitting 34mph."

Sammy, clinic parent

Gupta et al., 2021: trunk rotation cut peak shoulder torque by 75%; lower-limb swing raised wrist velocity 25%

You Asked for It.
We Listened.

You told us what would make your clinic experience even better, and we agree. Here’s what’s new.

1 Coach per 8 Athletes Max

We used to train up to 36 athletes per clinic. You asked for smaller groups, so we’re capping each session at 16 athletes. That means a lot more individual attention for every athlete.

1 Day In Person + 1 Month of Personal Follow-Up

Two full days of training is a lot. By day two, athletes are tired and have a hard time taking in more information. Real skills also take time to stick with any kind of training. So you asked if we could offer the second half of the clinic as live online training, and we did. Your athlete trains with us in person, then continues with live online coaching over the following four weekends.

Our Full Training System

In a single weekend, we could only get through about half of our training system. Working with your athlete over multiple weeks lets us cover the full system, which is key to long-term success.

The 8-Hour Clinic

What Happens
Onsite and Online

One 4-hour hands-on onsite clinic, followed by four 1-hour live online sessions over the next four weekends. Athletes leave with power hitting mechanics they can build on.

Onsite | 4 Hours
Learn & Feel

Live Online | Four 1-Hour Sessions
Train & Apply

Onsite | 4 Hours

Learn & Feel

Arm, shoulder and back mechanics for power hitting and arm speed

Hip turn and body rotation: feel the windup and unwind

Equipment fitting and instruction

Arm-speed exercises they can do at home

Connecting the approach, jump, and swing

Jumping and landing with control

Live Online | Four 1-Hour Sessions

Train & Apply

Review of the movements introduced onsite

Live drills with individual feedback and adjustments

Connecting the movements to hitting in the air

Building a consistent approach, swing, and landing

Progress review through movement observation and ball-speed measurements when available

Optional practice suggestions between sessions

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Included With Registration

Athlete Clinic Pack
$399 Value, Yours to Keep

Every registered athlete receives the full PC360 Clinic Pack at the event, with everything you need to keep training at home after the clinic.

Body Systems Trained

Arm Speed Hip Turn Shoulder Turn Rotator Cuff Core & Spine

In Your Clinic Pack

→ 1 Hip Harness

→ 1 Black Band (Light Resistance)

→ 1 Exercise Handle

→ 1 Anchor Strap

→ 1 Carry Bag

→ 1 Small Ball

Post-Clinic Access

→ Four live 1-hour online coaching sessions (1:4 coach ratio) over the four weekends after your clinic

→ 2 Months FREE PC360 Skool Community & Training Platform

→ 8-Week Arm Speed Training Program

→ Access to LIVE Group Training Sessions & PC360 Coaches

→ Multiple Training Courses (Arm Speed, Strength, Vertical Jump, ACL Injury Prevention)

Sizing Measured at Registration

Equipment is sized during registration and shipped to the clinic location. Athletes keep everything after the event.

Getting Started

Here's What Happens
After You Sign Up

Register

Choose your city and onsite session, review your four online session dates, and provide sizing information.

Equipment Ships

Your Clinic Pack ships to the clinic location, ready for your onsite session.

Train & Improve

Train onsite with elite coaches, take your Clinic Pack home, and continue with four weekly live online sessions. Leave with measurable results and a training roadmap.

2027 CLINICS

Spring & Summer Clinics