Players stop guessing
They know what a rep is supposed to change: swing path, arm action, timing, approach, movement, or confidence under pressure.
Boost BaseballBellevue Baseball Development
Build the Swing.Train the Arm.Prove the Work.
Parents shouldn't have to guess whether training is working. At Boost, every rep connects to a plan, every player gets coached with intent, and progress shows up in the numbers, the body, and the game.
How progress gets built
From first read to game-day results.
Development loop
Assess
Baseline first, then we build.
Before we prescribe reps, we learn how your athlete moves, swings, throws, competes, and responds to coaching.
- HitTrax, Rapsodo, video, and coach evaluation establish the baseline.
- Families get a clear read on strengths, gaps, and priorities.
- The plan starts with the player in front of us, not a generic program.
Assess
Baseline first, then we build.
Before we prescribe reps, we learn how your athlete moves, swings, throws, competes, and responds to coaching.
- HitTrax, Rapsodo, video, and coach evaluation establish the baseline.
- Families get a clear read on strengths, gaps, and priorities.
- The plan starts with the player in front of us, not a generic program.
Train
Purpose behind every rep.
Lessons, small groups, teams, and athletic training all point at the same goal: better habits that hold up under speed.
- Every rep has a purpose, whether it is swing path, arm health, speed, or approach.
- Coaches connect instruction across private training, team work, and camps.
- Players learn what they are changing, why it matters, and how to repeat it.
Track
Make progress visible.
Families should not have to wonder if training is working. We track the work so improvement has evidence behind it.
- Data, video, and coach notes show what changed from session to session.
- Players see the connection between better movement and better numbers.
- Parents get a clearer picture of momentum, not just another good-practice report.
Compete
Competition is the test.
The goal is not to look good in a cage. The goal is to carry better decisions, stronger mechanics, and more confidence into competition.
- Team play, tryouts, camps, and tournaments give the work a real test.
- Coaches watch how skills transfer when timing, pressure, and opponents change.
- The loop keeps going: compete, learn, adjust, and build again.
What changes here
The work gets clearer for everyone.
Parents see the pathway
The work is easier to follow because coaching, data, video, and game feedback point back to the same development plan.
Coaches keep adjusting
The loop does not end after one session. What shows up in training and competition shapes the next block of work.
“I take more worth in making a play look easier.”
Ichiro Suzuki
“Baseball is ninety percent mental. The other half is physical.”
Yogi Berra
“It's unbelievable how much you don't know about the game you've been playing all your life.”
Mickey Mantle
“Hard work doesn't start during the game. Hard work starts the night before.”
Ken Griffey Jr.
“Practice doesn't make perfect. Perfect practice makes perfect.”
Vince Lombardi
“It's hard to beat a person who never gives up.”
Babe Ruth
“If you're not practicing, somebody else is.”
Boost Baseball
Every rep should teach you something.Boost Baseball
Boost BaseballWho leads the work
Coaches who have played the game at its highest levels.
Players hear from people who've stood on the same mounds and in the same boxes they're trying to reach.
Former Seattle MarinerSean White
POSCo-Founder & Pitching Coach
CAREERMercer Island High School and University of Washington pitcher who spent four seasons with the Seattle Mariners, including a 2009 season with a 2.80 ERA across 52 outings.
Former Phillies draft pickAndre Marshall
POSCo-Founder & Hitting Coach
CAREERWashington Huskies outfielder and switch hitter, Phillies draft pick, seven-year minor leaguer, and 20-plus-year hitting instructor who helped Mercer Island High School win two state championships.
What players say
They made it to college ball.
I was the smallest and weakest player in the room. Four years with Andre gave me professional-grade tools — and a Division I caliber skill set if you meet him halfway.
Andre is one of the best outfield and hitting coaches I have been around. He develops players and cares about every person he coaches.
In a few lessons, Andre helped me find power and consistency I had not built in two years playing Division I college baseball.
Choose your next step
Start with the lane that fits today.
See it in person
Walk the floor. Watch the work. See the fit.
See how Boost assesses the athlete, builds the plan, tracks progress, and turns training into game-day confidence.