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
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.
WTFO believes in keeping you healthy. You are encouraged to perform exercises that are beneficial to your health, but challenge your will.
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.
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...Full Review
I've watched my body change shape over the past 16 months of working with Mark. And at first I didn't expect it... For most of my life, I thought that a...Full Review
Posting this for a friend who's a non-Yelper: Mark is an exceptional trainer. Both my brother and I went to Mark two months ago explaining that while we...Full Review