Mark Leffler - Certified personal trainer located in San Francisco, California.

My name is Mark Leffler and I’m an ACSM Certified Personal Trainer in San Francisco, CA.

I began my career in the fitness industry in the Greater Boston area of Massachusetts in 2009. Since then I have relocated to the west coast, have met some great minds in the industry, and have had the opportunity to work with many people of diverse backgrounds. Learn more

Principles I train by

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Education

WTFO believes in shared knowledge and educates clients, during their training, on the scientific disciplines behind an excellent foundation for your best fitness and wellness.

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Safety

WTFO believes in keeping you healthy. You are encouraged to perform exercises that are beneficial to your health, but challenge your will.

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Form and Function

WTFO believes maximum benefits, in strength and mobility, are achieved by aligning your training routine with physical demands encountered on a daily basis.

WTFO reviews

5 star overall rating 16 reviews
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Patricia H. yelp profile picture

Patricia H. says,

5 star overall rating 12/14/2017

Mark is an amazing trainer. My first visit I needed help getting up and down on the mat! Six months later I'm doing straight arm planks! I'm stronger and...

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Atch S. yelp profile picture

Atch S. says,

5 star overall rating 5/22/2017

Bottom-line: All the reviews for Mark are amazing because he's the trainer you want to have. I've worked out with Mark for years and I have no plan to...

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Mike K. yelp profile picture

Mike K. says,

5 star overall rating 10/7/2014

I've been working out with Mark for over a year and a half now, and am really glad I found him. Prior to starting to work with Mark, my workouts were...

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