About Us
Los Campeones is one of the last independently owned gym brands in the Twin Cities, standing strong with nine local locations and six more nationwide. We’re not just another gym, we’re a training ground for those who take their fitness seriously. Our community is built on intensity, discipline, and results, attracting competitive bodybuilders, powerlifters, Olympic lifters, and strongman athletes, along with anyone committed to pushing their limits.
Come see why we’re the best gym in town!
Meet the Los Campeones Team
Benjamin Loehrer
Owner of Los Campeones and 100% Drug Free NaturalPro Bodybuilder
Benjamin grew up on a farm in South Dakota, taking on responsibilities beyond typical farm chores after his father passed away when he was six. Raised by his single mother alongside his brother and sister, he developed a strong work ethic from an early age.
After high school, he planned to attend a Bible college in Canada, but its sudden closure left him without a plan. Instead, he entered and won a bodybuilding competition, where he was approached by Minneapolis bodybuilder Erik Fromm, who became his mentor. Erik, a respected trainer at Los Campeones, guided him for eight months before tragically passing away from an accidental overdose. Benjamin, who had been living with Erik and his fiancée at the time, was left uncertain about his future. Fortunately, Dr. Kevin of Lyn Lake Chiropractic took him in, providing stability until Benjamin moved into a house owned by Kevin, where he stayed for two years before meeting his wife, Amber.
Drawing from Erik’s mentorship, Benjamin built a personal training business, which grew steadily. The owner of Los Campeones saw his dedication and offered to sell him the gym. Instead of pursuing college, Benjamin saw running the gym as his education. He and Amber worked tirelessly, with Benjamin handling everything from opening to closing the gym each day. Over time, he transformed it, eventually expanding in 2014 by opening a second location on Blaisdell, followed by an expansion of the Franklin location.
Los Campeones has thrived for 34 years, outlasting many local gyms. Benjamin attributes its success to the sense of belonging it fosters—members are treated with respect, forming real friendships and a strong community. For many, the gym is more than just a place to train; it’s a home, a support system, and a second chance. Whether overcoming addiction, rebuilding their lives, or pursuing their passion as trainers, people find purpose here.
What began as Benjamin’s personal dream has become something far greater. One of his proudest achievements is not just revitalizing Los Campeones but creating jobs and opportunities for others, ensuring the gym remains a lasting force in the community.
Corporate Team
Calla Oberlander
Calla Oberlander became a member of Los Campeones Gym in 2022, and later that same year, she joined the team. Initially aiming to become a personal trainer, Calla was offered the role of General Manager at the Saint Paul location and decided to seize that opportunity. Over time, she has worked her way up to Vice President.
Calla is passionate about supporting both the team and members of Los Campeones. She is dedicated to helping everyone thrive, contributing to the continued success and growth of the gym.
Qualifications: Bachelors of Science, Plant Science and Entomology from U of M
Calla Oberlander Vice President of Marketing & Merchandising
Christian Klemmensen
Christian Klemmensen first discovered Los Campeones Gym on Franklin Avenue in 2012. After moving to the Twin Cities in 2016, he became a member of Los Campeones Gym Blaisdell. In 2019, Christian joined the Franklin team as front desk staff while also working in fitness operations. With a background in operations, general management, and personal training, he brought a wealth of experience to the gym.
In December 2023, Christian took on the role of General Manager for the Hudson, WI location. Over time, he transitioned into the position of Vice President, where he now oversees key aspects of the gym’s operations and marketing strategy.
Qualifications: B.S. Exercise & Sport Science, ACSM – Exercise Physiologist
Christian Klemmensen Vice President of Operations
Derrick Martini
Derrick Martini joined Los Campeones Gym with extensive experience in franchising, multi-unit operations, and brand growth within the fitness industry. With a background supporting both corporate and franchise locations, Derrick has spent his career helping fitness brands scale while maintaining strong unit-level performance and culture.
At Los Campeones, Derrick leads club growth and franchise operations, overseeing new market expansion, site selection, franchisee onboarding, and operational support across both corporate and franchised locations. He plays a key role in guiding gyms from initial concept through opening and into long-term performance, ensuring consistency, accountability, and sustainable growth as the brand expands.
Derrick’s approach blends data-driven decision-making with hands-on operator support, helping franchise partners and internal teams build profitable, high-performing gyms while preserving the authentic Los Campeones culture.
Derrick Martini Vice President of Club Growth & Franchise Operations
William Petersen
William Petersen has spent 10 years working in the fitness industry, with experience across various areas including Member Services, Marketing, Machine and Gym Maintenance, Product Inventory, and Training and Development of staff. In addition to his career, William has a passion for bodybuilding and personal training. He also enjoys sports and values spending quality time with his dog and girlfriend.