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Why are so many former professional athletes’ kids successful at sports?
The percentages are staggering, and it’s not because they are the most gifted athletes...but because they are taught the professional mentality.

About Boost Baseball


We are an independently owned business that operates out of Bellevue, Washington. Co-founders, Sean White and Andre Marshall, former MLB and MiLB players, strive to provide their baseball valuable experience to other passionate players. Our high-quality coaches and equipment allow us to provide consistent, professional, and personal instruction to each player. By identifying areas that can be improved, players are able to develop strong skillsets, ultimately leading to success. 


Our coaches work with children as young as 5 all the way up to the professional level, developing hitting and pitching skills through various programs. In our programs, we work to offer an unmatched sense of guidance and instruction. Boost Baseball covers it all through an unbiased approach that solely focuses on player development.  

Why Choose Boost Baseball? 

Quality Instruction

Quantitative Performance Tracking

Individual Player


Guaranteed Results

Boost Strength training


HITTING program

Outdoor training camps


pitching program

boost hitting and pitching lessons


fall ball

clinics for 8 year olds up



improving mechanics


boost development


Sean Profile



Sean White is a former professional baseball player with a distinguished career both on and off the field. Growing up in Mercer Island, Washington, Sean showcased his pitching skills at Mercer Island High School. Opting for collegiate baseball over an immediate professional start, he attended the University of Washington.

As a Husky from 2000 to 2003, he excelled as a starting pitcher, earning All-Pac-10 honorable mentions in both 2002 and 2003. Over four seasons with the Mariners (2007-2010), he maintained a win-loss record of 4-4 and an ERA of 4.16. His peak performance in 2009 included a 2.80 ERA across 52 outings, earning him the title of Mariners’ 2009 Unsung Hero by the Baseball Writers Association of America.


Andre Marshall


Andre Marshall, outfielder and switch hitter, played for the Washington Huskies. Drafted by the Philadelphia Phillies, he went on to play minor league baseball for seven years.

Been a hitting instructor over 20 years and have had hundreds of HS players that went on to college and professional baseball. Coached at Mercer Island HS for 12 years and won 2 state championships.

​​Coached outfield hitting and Baserunning at Mercer Island HS


Nikki Visone


Visone graduated from Cimarron Memorial in 2013. After his Freshman year at Mt. San Jacinto CC (CA) he transferred to Madison, WI to finish his eligibility at Edgewood College posting a career .400 OBP.

Transitioning to coaching, Coach Visone took an assistant job in Las Vegas at Legacy High School. 

Nikki is currently a graduate assistant at Seattle University (D1), and in charge of baseball operations for Boost Baseball. 


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Former Atlanta Braves MLB Scout

Played Collegiately at San Diego State University 1988 - 1990

Played Professionally for the Taiwan, Taichung Blackhawks.

Basehall Camp Director for Seattle Mariners, Mike Blowers and Julio Cruz.

Association of Professional Baseball Player's of
America * Lifetime Member #5854

Invented the Baseball Retriever Fungo Bat / with Bill Nye " The Science Guy"



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After graduating in 2014 from Yukon High (OK), pitched for Cowley College (KS) won a conference championship and played in the D1 JUCO WS. In 2016 transferred to Okla. Christian Univ and was selected as an All-Conference Honorable Mention.

Posted a career 3.77 ERA in 3 professional seasons in Independent Leagues (Parter MLB Leagues)

Currently 3+ years of experience training athletes to be more efficient in their movements and patterns.
2 years coaching college baseball in the PIL and WCL leagues with the Redmond Dudes.




Colton Turner, is the Head Velocity Trainer at Boost Baseball and the head coach of the 2025 New Level Boost 13u team.Colton specializes in biomechanics and overall efficiency, with a focus on helping athletes gain velocity while staying healthy and improving their pitching skills.


With four years of college baseball experience, and occasionally playing in national men’s fastpitch tournaments, Colton’s passion for the game is evident in everything he does.Colton is committed to not only improving his players' physical performance but also enhancing their knowledge of the game and boosting their confidence both on and off the field.

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William Jessup College

I first met Andre when I was 15 and trained with him almost every day for four years. If you put in the time and effort and do what he tells you to do, the sky is the limit. I was the smallest and weakest player with little talent. Andre gave me the tools from a professional perspective that allowed me to develop a division 1 caliber skill set. His meticulous nature will assure progression in all areas of baseball, if you want it. He will give you every tool, you just have to meet him half way.​

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Oregon State University

It has been an honor to have been coached by Andre. Andre is one of the best outfield/hitting coaches and he knows the game better than anyone. He is extremely talented with his ability to develop young men into great baseball players. Andre has helped me a lot with not only my out-fielding but also my swing. He is a great man and really cares about every person he coaches. His passion for the game is unbeatable. I'm truly blessed to have him as one of my mentors in my life.

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Holy Cross University

Over the course of a few lessons, Andre helped me find power and consistency in my swing that I had not developed in my two years playing division 1 college baseball.

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