About Marcus Reeves
Marcus Reeves is an exercise science writer who specializes in the intersection of pharmacotherapy and physical training — specifically, how patients using GLP-1 receptor agonists can preserve lean body mass during periods of rapid weight loss. A former Division I track and field athlete at the University of Michigan, Marcus experienced firsthand how body composition shapes performance, recovery, and long-term health. That athletic foundation led him to graduate research in kinesiology, where he studied resistance training adaptations in clinical weight management populations — work that gave him an unusually practical understanding of what happens to muscle, bone, and metabolism when the scale drops fast.
After completing his Master of Science in Kinesiology at Michigan, Marcus spent three years as an exercise physiologist in a hospital-based bariatric wellness program, where he designed supervised exercise protocols for patients preparing for and recovering from metabolic and bariatric surgery. It was during this period that GLP-1 medications began appearing in his patients' treatment plans, and he watched the conversation around weight loss shift almost overnight. He saw patients losing significant weight on semaglutide and tirzepatide — but he also saw the muscle loss, the fatigue, and the deconditioning that often followed when exercise programming wasn't part of the equation. That gap between pharmacological success and physical resilience became the core of his writing.
Marcus joined Losing Weight RX to bring an evidence-based exercise science perspective to a space dominated by medication-focused content. His articles are grounded in peer-reviewed exercise physiology research, and he draws on his clinical experience to make recommendations that are realistic for people who are not athletes — people managing fatigue, joint pain, and the day-to-day realities of life on a GLP-1 medication. He is a Certified Strength and Conditioning Specialist through the National Strength and Conditioning Association and a member of the American College of Sports Medicine. He believes that the most important rep is the one a patient actually does.
