Meet Our Instructors
Our team of experienced and passionate instructors is dedicated to the design and instruction of high-quality fitness programming. Get to know the faces behind the studio.
Marielise Rodriguez Sosa, CPT/GFI
Director & Lead Instructor
Marielise holds her bachelor of science in kinesiology from Texas A&M International University. Marielise has dedicated her professional career to the instruction and program design of various exercise modalities including strength training, Pilates, Spinning, and Lagree. During her formal education, Marielise formed a part of the University Honors and Undergraduate Research Program and dedicated her work to exercise physiology. Marielise participated in the ongoing research, "Changes of Inflammatory Cytokines after 4-week and 8-week Aerobic Exercise in Hispanic Obese Females". In 2024, this research was published and presented by Marielise and colleagues at the American Physiological Summit, a nationwide premier event for physiologists and life science researchers, that took place in Long Beach, California, that year. With her educational background in exercise science, Marielise emphasizes the importance of cross-training within different modalities for a well-rounded fitness routine, or regimen. Her area of focus is strength training to develop healthy muscle mass and body composition, promote functionality, and increase metabolic rate. The importance of body composition, rather than the number on a regular scale, is what drove the InBody scan to be one of Régimen's outstanding services.
Marielise invites you to try Lagree, a muscular strength and endurance workout, that is high-intensity, yet low impact and anti-inflammatory. She has undergone training in Mexico City and San Antonio, Texas, to perfect the Lagree method for Régimen. This past November, Marielise completed her lagree trainer certification and became the first and only certified lagree trainer in Laredo. Régimen welcomes the sophisticated Lagree method, a revolutionary fitness theory created by inventor, CEO, and founder of Lagree Fitness, Sebastien Lagree. From France to Laredo, with more than 200 patents, over 500 studio locations worldwide, LAGREE has landed at RÉGIMEN.
José Villa
Barre & Pilates Instructor
With a dynamic background in fitness, ballet, and dance, Jose brings unstoppable energy and charisma to every barre and pilates class. His high-energy approach blends precise movement with a strong sense of rhythm, creating a workout that’s both challenging and fun. Whether you’re new to his classes or a seasoned pro, you’ll leave his classes feeling empowered, inspired, and ready to move!
Marissa Guerrero, GFI
Pilates & Yoga Instructor
Marissa Guerrero (Mar) has dedicated the past decade to helping others discover strength, balance, and confidence through movement. Certified as a Group Fitness Instructor through ACE, and holding additional certifications in Pilates and Yoga through SCW. Her background spans multiple formats, including Pilates, yoga, cycling, strength training, HIIT, dance fitness, and cardio kickboxing. At Régimen, Mar’s classes integrate her extensive fitness background, ranging from challenging your endurance and balance in pilates, to quieting your mind and connecting you more deeply with yourself in yoga.
Jesse Villarreal, CPT
Strength Instructor &
Texas A&M International University Kinesiology Practicum Student
Jesse is an ACE-certified personal trainer with an extensive background in personal training, group weightlifting, and high-intensity interval training (HIIT). He has been practicing his profession for nearly three years at Texas A&M International University Recreational Sports, where his sessions and classes hold a strong focus on proper technique, safety, and performance. Jesse is currently pursuing his bachelor in kinesiology with a concentration in health and fitness at Texas A&M International University, where he will be graduating this semester! Throughout his academic coursework and experience, he has developed a solid foundation in exercise programming, movement mechanics, and client-centered training. Régimen welcomes Jesse as he completes his practicum in kinesiology and applies the theoretical knowledge that he has learned throughout his degree. He is looking forward to training you and for you to experience high-quality programming!