Executive Team


Glenn Seth

RKC, WKC, LMT: Owner, Master Trainer

Glenn has been training with kettlebells for more than fifteen years after serving as a US Marine, and has certifications from World Kettlebell Club (WKC), Russian Kettlebell Challenge (RKC) and ACE. He has trained with world-class athletes Valery Fedorenko and Catherine Imes. Glenn's unique teaching approach to kettlebell training focuses on flow which, along with fitness and function, give F3 its name. At F3 Training and Bodywork, rated best kettlebell workout by the Washington Post, Glenn and his team offer a progression program for new clients to advance their kettlebell practice through four stages, called the Path of the Warrior. For advanced students and local trainers, Glenn offers DC's only kettlebell certification program, The VonSeth Method. He is also a licensed massage therapist with over fifteen years of hands-on training and experience in top spas in and around DC.


Sarah Seth

MBA, HKC: Business Manager

Sarah was born in Paris but grew up in Cote D’Ivoire (her country of origin) and France until moving to the USA in 2008 to continue her studies. She became a strong advocate for fitness and wellness after she decided to adopt a healthier lifestyle six years ago, which resulted in a significant weight loss and drastic improvement in her health and wellbeing. Sarah was introduced to kettlebell training and the health and wellness industry by her husband Glenn in 2013 and it automatically turned into her passion. Having witnessed the life-changing effects of kettlebell training, she was inspired to use her business management background to assist her husband in growing their family business and sharing the tremendous mental and physical benefits of fitness training and massage therapy with their community. Sarah holds a bachelor’s degree in Business Administration from Temple University and a Master of Business Administration from University of Maryland University College. She is also a Hardstyle Kettlebell Certified (HKC) Instructor. She loves traveling and discovering new cultures with her family and is dedicated to raising a healthy, happy daughter.


Kettlebell Training


Danny Lamas

B.A, HKC: Head Trainer

Danny is a certified F3 coach and Hardstyle Kettlebell Instructor. He has trained under Master Trainer Glenn Seth since 2011. He has a B.A. from George Washington University in Political Science. He was inspired to take up kettlebells as an enthusiast of author Tim Ferriss' books on entrepreneurship, learning, and fitness. The efficiency of full-body kettlebell workouts in improving functional strength and producing rapid fat loss inspired him to become a regular at F3 for more than two years before becoming an instructor. Danny enjoys presenting clients with new and exciting challenge through consistently varied workouts.


Massage & Yoga

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Lauren Newmyer


Lauren loves helping people find a deeper sense of mind/body harmony through thoughtful, personalized Bodywork and yoga sessions. Her massage style encourages a deep sense of relaxation while targeting specific muscles to effect lasting change and restore balance in the body. Her work draws upon her studies in traditional Thai massage, active isolated stretching, and myofascial release. Her yoga sessions are informed by her extensive knowledge of anatomy, and inspired by the latest trends in the growing field of yoga therapy. Lauren is a graduate of the New School for Massage Bodywork and Healing, and Willow Street Yoga Center's teacher training program. 

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Erika Bakkar


Erika received her education from the Potomac Massage Training Institute (PMTI) in Silver Spring, MD. As a health & wellness practitioner, she is able to offer the "ultimate body experience" with the use of varying modalities. Her modalities include Swedish, Deep Tissue, Hot Stone and Prenatal massage. Using these techniques bring her the most pleasure, which is making others happy and feeling great about themselves. From personal relaxation to injury recovery, her work is holistic and assists you in achieving balance in your body.