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Earth City, MO · Est. 2013

Is Your
Athlete
Getting
Left Behind?

While other kids train with elite coaches, yours is falling behind on speed, strength, and explosiveness — the exact metrics that win starting spots, earn scholarships, and unlock NIL deals.

Claim Free Athletic Assessment See How It Works
10+
Years Coaching
Pro
Bodybuilder
NIL
Ready Training
Group
Training
Only 3 Spots Left This Month
Free Athletic
Performance
Assessment

20 minutes with Coach Kenny. We evaluate your athlete's speed, strength, agility, and explosiveness — and map out exactly what they need to level up before their next season.

9 of 12 spots claimed this month

No commitment. No sales pitch. Just results-focused coaching.

or dial (877) 515-FLEX
The Reality

What's Holding Your
Athlete Back

⚡
Falling Behind on Speed

Speed is the #1 differentiator at every level. Without targeted training, the gap between your athlete and the competition widens every season.

0.3s
Average speed gap between starters and bench players
🏆
Missing Recruiting Opportunities

College scouts watch measurables first — 40 time, vertical, strength numbers. Athletes who don't train specifically for these moments get overlooked.

70%
Of college-bound athletes never get recruited without active development
🎯
Generic Training Doesn't Cut It

Generic gym programs and big-box fitness classes aren't built for sport-specific performance. Your athlete needs a program designed for competitive athletes — not general fitness.

3×
Faster improvement with sport-specific group performance training vs generic programs
Owner · Personal Trainer · Pro Bodybuilder
Coach Kenny Sims
Flex Facility — Earth City, MO

Since 2013, Coach Kenny has been developing athletes at every level — from first-time players to elite competitors. As a pro bodybuilder and certified trainer, he brings a level of knowledge and intensity that most coaches simply can't match.

Pro Bodybuilder & Certified Personal Trainer
10+ Years Developing Athletes
Custom Training & Nutrition Programs
Small-Group Performance Training — In-Person & Virtual
NIL Performance & Visibility Training
What We Deliver

Your Athlete Will
Outperform
The Competition

Every program is custom-built around your athlete's sport, position, strengths, and goals. We don't do generic. We do results.

⚡
Speed & Agility Training
40-yard dash, lateral quickness, first-step explosion
💪
Strength & Power Development
Sport-specific strength that transfers to the field or court
🧠
Custom Nutrition Plans
Fueling for performance, recovery, and body composition
🎯
Combine & Tryout Prep
Targeted programs built around specific evaluation dates
Name · Image · Likeness

Train Like a Pro.
Get Paid
Like One Too.

NIL changed everything. High school and college athletes can now earn real money from their name, image, and likeness — but only if they look the part.

Brands don't sign athletes who blend in. They sign athletes who stand out — physically, visually, and competitively. Coach Kenny's training builds the performance metrics and the physique that make athletes impossible to ignore by scouts, sponsors, and brands alike.

$1B+
NIL market in 2024
50K+
Athletes earning deals
HS
Eligible in most states
01
Performance = Visibility

The athletes earning NIL deals aren't just talented — they're measurably elite. Coach Kenny's training builds the speed, strength, and physique that gets athletes noticed on film and in person.

02
Build a Body Brands Want

Physique matters in the NIL economy. Training with a pro bodybuilder means your athlete develops not just athletic performance but the presence that attracts sponsorships.

03
Get Ahead Before College

Most athletes wait until college to think about NIL. The ones who arrive already built and performing at an elite level are the ones who land deals Day 1 on campus.

Ready to build an NIL-ready athlete? Start with a free assessment — Coach Kenny will map out exactly what your athlete needs to compete at the next level and attract real attention.
Start Free Assessment →
We Train Champions In

Your Sport Is Our Sport

🏈
Football
🏀
Basketball
⚾
Baseball
🏃
Track & Field
⚽
Soccer
🤼
Wrestling
How It Works

From Assessment to Dominance

01
Book Your Free Assessment

We learn your sport, your goals, and where you're at. Coach Kenny evaluates speed, strength, agility, and explosiveness. Zero cost, zero pressure.

02
Join the Group

You train alongside other competitive athletes. The energy is real. The competition is real. Group sessions built for athletes who want more.

03
Get Pushed Further

When someone next to you is grinding, you grind harder. That's the Flex effect. Every session is tracked so you can see real improvement in real numbers.

04
Show Up Different

Better speed, strength, and confidence — on the field and off it. Show up to tryouts, combines, and games as the most prepared athlete out there.

Coach Kenny — Flex Training Est. 2013

Meet Coach Kenny

Certified Sports Performance Trainer · Flex Training Est. 2013

Coach Kenny has been building competitive athletes since 2013. His group training model is simple: put serious athletes in the same room, push them hard, and watch them rise. Whether you're training for your sport or just ready to get serious, Coach Kenny meets you where you are — and takes you further.

Book Your Free Assessment →
Results That Speak

Athletes Who Leveled Up

Football · Wide Receiver
0.4s
Improvement in 40-yard dash in 8 weeks

"My son went from being the slowest on the team to one of the fastest. Coach Kenny's program is different — it's built for athletes, not just anyone who wants to get in shape."

DT
David T.
Parent · St. Louis, MO
Basketball · Point Guard
+6"
Vertical jump increase in 10 weeks

"She made varsity as a sophomore. Coach Kenny focused on her explosiveness and first-step quickness and it showed immediately. The recruiters noticed."

MJ
Michelle J.
Parent · Earth City, MO
Track & Field · Sprinter
State
Qualified for state championships

"I've been training with Coach Kenny for 6 months and the difference is night and day. He pushed me harder than I've ever been pushed and the results speak for themselves."

KR
Kyle R.
Athlete · 17 yrs old
Follow the Journey

See What's Happening

Limited Spots Available

Don't Let
Tryouts
Decide For You

Every week without elite training is a week your competition is pulling ahead. Book your athlete's free assessment today — spots fill fast.

💰
This Is Also NIL Training
Athletes who train with Coach Kenny don't just perform better — they look the part. The physique, the measurables, the presence. That's what scouts and sponsors are paying for. Start building it now.

No commitment required · 20-minute session · Earth City, MO or Virtual

Not training for a sport? Check out our Fitness & Bodybuilding programs →
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Kinetic Ken
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