Dr. Charlie Seltzer Lifestyle Medicine Team

Jake Mendes

personal trainer

Hi there! I'm Jake, and I bring over 14 years of diverse fitness industry experience to Rx Training, having worked in nearly every role imaginable across New York City and Denver—from personal training and group fitness to management in personal training and studios, corporate education, and program design. I hold a degree in musical theatre and dance from the University of Northern Colorado, and I'm deeply passionate about creating inclusive spaces where everyone—whether you're a veteran lifter or have never picked up a dumbbell—feels welcome to practice their fitness. I love helping people step outside their comfort zones and discover they're stronger than they think they are.

I grew up in Colorado, and as of June 2026, my husband, our cat George, and I are new to Philadelphia via NYC—excited for our next adventure in the City of Brotherly Love. Outside of Rx Training, I'm continuing my career as a singer and theatre artist, and I'm looking forward to connecting with the vibrant Philly theater community. And if anyone has recommendations for a great cinnamon roll, please don't keep it to yourself!