Major League Assistant Strength & Conditioning Coach

Seattle Mariners

Peoria, Arizona · MLB · Posted October 12, 2026

$75K – $90K /year

Primary Objective: The Assistant Major League Strength and Conditioning Coach will be an integral part of a dynamic team within a high-performance professional baseball environment. This role involves supporting the Head Major League Strength and Conditioning Coach in delivery of Strength & Conditioning services to the Major League Team. We are seeking a motivated individual who is eager to build strong relationships, foster interdepartmental collaboration, and maintain consistent, effective communication. The ideal candidate will contribute to a culture of progressive thinking and innovation.

Essential Functions:

  • Hold the gym environment to a high standard and in line with current cultural expectations.
  • Create and develop program design models for use in daily preparation, lifting, and conditioning in a professional baseball setting.

  • Assist in the creation and development of player performance screens and assessments.
  • Monitor daily, weekly, and monthly reports from MLB athletes.
  • Communicate with Athletic Training, Rehab, PT staff daily to provide a team first approach.
  • Collaborate with field staff & coordinators to maximize player performance.
  • Assist Director of Player Performance to act as a support system for the S&C coaches for questions and clarifications.
  • Communicate with the Major League S&C Staff to maintain uniformity throughout the organization to provide a seamless transition for all return-to-play athletes under 40-man regulations.
  • Assist in managing budget and financial reporting.

 

Education and Experience:

  • CSCS and RSCC certifications
  • Previous experience in high-level baseball setting (preferred)

Competencies, Knowledge, Skills and Abilities (KSA’s):

  • Must be a committed professional, with strong analytic focus. 
  • Ability to relate to athletes and generate program buy-in.

Physical Activities and Working Conditions:

  • Maximum lifting of up to 100 pounds with frequent lifting of weights up to 50 pounds; typically standing and walking for most of the day
  • Position will require non-traditional work schedule including evenings and weekends.
  • Position may require travel.
  • Position is based out of Peoria, Arizona, and Seattle, Washington.

Compensation Rate/Range:

The anticipated salary range for this role is $75,000-$90,000 annually. The Mariners also provide a robust and unique offering of perks and benefits including paid public transportation, merchandise discounts, special access to baseball games and other public events, and a number of exclusive employee incentives. All perks are subject to eligibility requirements and availability and may be modified or amended from time to time.

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Posted by Seattle Mariners. SportsCareers is a job board, not the employer. Applying takes you to their official careers page.

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