Our Story
The concept of First Guess Fitness was first conceived when Justin and Patrick were working together at another gym. Although we had a beautiful environment, great equipment and highly qualified coaches, we knew there was something else missing.
Clients still lacked clarity outside of the gym and there wasn't a sense of community that we know plays an integral part in keeping clients engaged and wanting more.
So we set up First Guess Fitness, first as an online learning platform that covered all the fundamental knowledge you needed to make real progress. We shared what we had learned about exercise, nutrition, mindset and accountability and set about going beyond the hour on the gym floor to helping people create more clarity, consistency and confidence.
As our success grew, we were presented with an opportunity to open up a physical space in downtown Boston and we snatched the opportunity to give First Guess Fitness a physical home and create a space where fitness is fun and the community is amazing.
Meet the Coaches
Justin Kompf
Behavior Change & Exercise Coach
Justin has been coaching since 2009. From 2013 to 2017 he worked as a college strength coach while completing his master's in exercise science. Around that time he became more interested in behavior change, helping people who never exercised get started. So he moved to Boston in 2017 to begin his PhD. In 2021 he began a postdoc at Brandeis University but a little more than a year in he was asked to serve as the fitness director for a telemedicine weight loss clinic. That clinic was subsequently acquired by WeightWatchers. Justin had been personal training in Boston throughout his career there and when the opportunity to start a physical location came up he jumped at it! Justin focuses on the intersection of behavior change and exercise prescription. He believes everyone can become a consistent exerciser with the right support structures.
Patrick Jennings
Strength & Lifestyle Coach
Patrick is a strength and lifestyle coach who helps clients create lasting change by focusing on who they become — not just what they do. His philosophy is simple: where you are physically, mentally, and spiritually is a reflection of your thoughts, behaviors, and beliefs. If you want to change your life, you start by changing yourself. His journey into coaching began after college, living across the USA, France, and Australia. While working at a boutique fitness studio in Australia, he fell in love with helping people grow. That path led him back to the U.S., where he earned his Master's in Exercise Science and spent the next decade coaching in studios across the country before opening his own gym. Patrick approaches coaching with empathy, humor, and a genuine interest in every client's story. He believes self-belief is one of the most powerful — yet most overlooked — tools for transformation.
Scout 🐕
Chief Morale Officer
Scout doesn't really do much coaching. In fact, he is adamant that you give him treats. He mostly sleeps and appreciates belly rubs. Most members say he is their favorite coach — Justin and Patrick struggle emotionally with this knowledge every day.
Looking for personal training in Boston? First Guess Fitness is a top-rated private fitness studio in Downtown Boston at 30 Court Square — offering 1:1 personal training, semi-private training, strength coaching, and online coaching.
Neighborhood pages: Back Bay · South End · City Hall · Faneuil Hall · Government Center · Pricing