Boston Underground Strength Training is a 2,500 sqft. private strength and conditioning training facility. We offer a simple, no-nonsense approach to training in a high-energy environment, focusing on both individual and group training. We keep it simple - our facility is equipped with the essentials and our highly-motivated coaches are there to ensure you make progress each step of the way. Our focus first and foremost is educating you on proper training, while also helping you move better and get stronger.
The most important part of training is having the courage to allow yourself to take on what you never thought you could. Similar to most other things in life, step one is building a foundation. For those who have already begun the process, it’s about identifying both the weaknesses and strengths and then building upon them. Training allows you to do much more than become physically strong, it creates opportunities to push yourself and grow so that you can lead the most satisfying life.
We want to help you create those opportunities. We want to help you break the mold.
I can't recommend this place enough. For the first time in my life I enjoy going to the gym. It changed my life. ~ Hayley H.
I couldn't have asked for a better place! Even while struggling to get out of bed after day 1, I found myself anxious and excited for our next workout. ~ Adam C.
/ Angel Jimenez
Angel Jimenez is the Owner of Boston Underground Strength Training in Waltham, MA. He is a Strength & Conditioning Coach with a high level of care for the clients and athletes he trains within his community. Prior to coaching, Angel served in the United States Marine Corps. during 2003-2007, while also completing one tour in Iraq. He received the Certificate of Commendation in 2006 for his service in Iraq. Additionally, he was granted an Honorable Discharge in 2011, after serving as the Platoon Sergeant while in command of over 70 Marines.
He began his academic work at UMass Lowell within their Bachelors of Science Nursing program. After successfully completing three years within the program, he ultimately decided that the field of Strength & Conditioning was his true passion, and also a field in which he felt he could provide the most positive impact. Angel then transferred to Lasell College and graduated with a Bachelors Degree in Exercise Science, helping to enhance his knowledge in the areas of strength training, physical fitness, and sports performance. Throughout his entire academic career, Angel had also been training clients in both the private and collegiate sectors.
Angel is a Certified Strength & Conditioning Specialist (CSCS) through the National Strength & Conditioning Association (NSCA), and also a Precision Nutrition Certified Nutrition Coach (Pn1). He has completed Strength & Conditioning internships at the world-renowned Cressey Sports Performance, Northeastern University, and Emmanuel College, while working with a wide variety of athletes in multiple sports (baseball, basketball, hockey, rowing, diving, soccer, and softball) within the youth, high school, collegiate, and professional levels.
In September of 2014, he opened Boston Underground Strength Training to provide a simple and no-nonsense strength training approach with a primary focus on both individual and group adult training, and also sports performance training for athletes. In addition to training the general fitness population at Boston Underground Strength Training, Angel also works with athletes looking to enhance their overall performance. The high school and collegiate-level athletes training at his facility have played field hockey, football, basketball, hockey, and soccer. He has also worked with Muay Thai fighters, triathletes, and marathon runners.
/ Jon Shepard
Jon Shepard is a Strength & Conditioning Coach and a former professional Minor League Baseball player. As a former elite-level athlete who also overcame a severe head injury, Jon understands the perseverance, hard work, and commitment needed to achieve health, fitness, and performance goals.
During his senior year at Triton Regional High School, he was selected to the All-State baseball and basketball teams after undergoing a major head accident and losing multiple Division I scholarship offers. He then went on to complete his Bachelors of Arts degree in Sociology with a minor in Psychology and Economics through Wheaton College (Norton, MA), while also spending time working with athletes in the Special Olympics. Jon took a Division III scholarship at Wheaton where he went on become an All-American baseball pitcher in 2010. He had professional baseball invites to try out for the Tampa Bay Rays, Baltimore Orioles, and New York Yankees. Through 5 years of professional baseball, Jon played in the Can-Am League, the Frontier League, and the Atlantic League. Additionally, he spent one season as a Division III college pitching coach at Rivier University.
Jon is a Certified Strength & Conditioning Specialist (CSCS) through the National Strength & Conditioning Association (NSCA), a Certified Personal Trainer (CPT) and certified in Speed, Agility & Quickness through the National Academy of Sports Medicine (NASM). Being a former athlete, Jon had always been interested in pursuing a career in the Strength & Conditioning field and learning more about human performance. He began this path working simultaneously as a Personal Trainer at a Sports Performance Training Facility and a Physical Therapy Rehabilitation Aide at McGovern Physical Therapy. During this time, he worked with athletes in the youth, high school, collegiate, professional, and Olympic ranks.
As a coach at Boston Underground Strength Training, Jon uses his career experience and background as a former professional athlete to help clients and athletes alike to excel past their goals and realize their true potential.