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Coaching Staff

David Osorio

David comes to the CrossFit community with over 10 years of coaching experience ranging from physical therapy clinics to competitive speed schools. Additionally, David holds a B.S. in Exercise Physiology from West Chester University of PA and has been a Level 1 certified CrossFit Trainer since 2007. He is also a certified Starting Strength coach.

CrossFit South Brooklyn was started by David back in 2007 out of St. Mary's Playground in Carroll Gardens.  His goal has always been to create a fun and inclusive training environment for people serious about their fitness. CFSBK was the first CrossFit affiliate in Brooklyn and has since become one of the largest in the city and most respected in the world.

On top of coaching private training clients and group classes, David also teaches our CrossFit Preschool and CrossFit Kids programs. David's youngest athletes are 3 and his oldest is 78.

David has also worked as Competition Director for the for CrossFit Games North East (now East) Regional competitions since 2009 and writes the popular CrossFit coaching and buisness blog Inside the Affiliate

Contact: David(at)

Jeremy Fisher

Jeremy's long and diverse athletic background gives him athorough understanding of training, both for a specific sport and for general strength and conditioning. Wrestling, track and field, crossfit and powerlifting are among the disciplines he has pursued competitively. He believes strength is the foundation of life and supports anyone committed to getting under the bar regularly.

In the tradition of Mark Rippetoe, Jeremy's Strength Intensive program has become an important adjunct to CFSBK's CrossFit programming. Through it, he has trained a varied population including male and female novices, deconditioned and recovering athletes, pregnant women, and competitive lifters. In fact, several of his novices have gone on to compete as raw lifters with the USAPL.

Jeremy placed 32nd in the 2008 Crossfit Games, competed in the 2009 Northeast Regional Qualifiers as an individual, and in 2010 as an affiliate team member. In addition, he has competed as a raw lifter with the USAPL.

Jeremy is a certified Starting Strength coach and holds a CF Level 1 certification. He attended Robb's Wolf's Paleo Solution seminar, Kelly Starret's Mobility and Recovery Seminar and Chip Conrad's Brutal Recess

Contact: Jeremy(at)

Christian Fox

A former natural foods chef, Christian has been training a variety of populations from 8 to 80 years old for over 6 years now. With a eye for mobility issues, he specializes in helping clients and members gain, train through, and maintain healthy ranges of motion. Since earning an AAS degree in Exercise Science from CUNY Kingsborough he has logged countless hours of continuing ed and certifications including: NASM Certified Personal Trainer/Corrective Exercise Specialist, CrossFit Level 1 Trainer,certified Starting Strength Coach, CrossFit Movement and Mobiity, CrossFit Endurance and many more.

Active but not necessarily athletic as a youth, Christian is not only president but also a member of the Former Fat Boy Club. He can help you develop a plan for how to eat and train that can get you to your goals (so long as you’re up for the hard work). His goal is to educate and inspire people to make being strong and fit a lifestyle choice that they stick with long term.

Contact: Christian(at)

Nick Peterson


A recovering rower, avid barefoot runner, and lapsed capoeirista, Nick has coached at CFSBK since 2011. Nick fell in love with rowing in 9th grade on the Potomac, and accrued 13 years of competitive rowing experience, culminating in the 2000 Olympic Games, in Sydney (men's quadruple sculls). For years afterward he worked out as he always had—running, lifting, rowing on the erg, sometimes trying to do handstands—until his wife discovered CrossFit and started sending him videos at work of CrossFit workouts with such NSFW subject headings as "More CrossFit Porn." (His wife also introduced him to capoeira, which he adored but eventually dropped to make time for CrossFit.) 

Nick met Margie at the Park Slope Food Coop, and soon thereafter became CFSBK's resident rowing coach. He eventually got into coaching CrossFit group classes and training clients one-on-one.  Nick still conducts a few rowing workshops a year and has taken a group of CFSBKers to CRASH-Bs, the preeminent international indoor rowing championship in Boston, very year since 2010. 

Nick is a CrossFit Level 1 coach, and attended Robb's Wolf's Paleo Solution seminar and Kelly Starret's Mobility and Recovery Seminar. 

Also, if you're at all curious about public spaces and want to know about William H. Whyte, Jane Jacobs, Hans Monderman, or David Engwicht, just ask Nick—he's a total nerd about that stuff.

Contact: Nick(at)

Noah Abbott


CrossFit training was a natural fit for Noah, giving him an edge during his career as a Special Agent with the Department of Homeland Security. Eventually, the more tangible challenge and reward of helping people revolutionize their fitness and lifestyle led Noah to leave DHS and pursue coaching full time. 

Since that critical juncture, Noah has shown a voracious appetite for acquiring knowledge and developing his understanding and fluency with coaching movement and optimizing performance.  Noah's current certifications include: 

Noah contributes original content to the CrossFit South Brooklyn blog and Inside The Affiliate website and has consulted as a subject matter expert for Muscle and Fitness, Shape, The New York Times, and New York Post.  He runs the CrossFit South Brooklyn Teens program and co-runs Anti-Gravity, our bodyweight-only strength, skill, and conditioning class.

Contact: Noah(at)

Jessica Fox

It’s unclear whether the shear boredom of Ohio country life or the influence of a sports-lovin’ family triggered Jess’ athletic endeavors. Jess began playing softball as soon as she was old enough to enroll then quickly added basketball and soccer to keep her busy year-round.  After moving to NY for college, Jess took a hiatus from sports…unless you call flip-cup a sport.  Unsure how to return to physical activity, Jess gave everything from running to Bikram yoga to kickboxing a try.  Luckily, her future husband got her to join a gym, lift weights and eventually led her to Crossfit.  Crossfit helped her complete her first Marathon in 4:19, has made her a more powerful hitter in her softball league, and CFSBK has given her a family outside of Ohio.

Jess loves being a strong female role model in the gym and really enjoys pushing female athletes in the same direction.  She enjoys working with newer athletes because she vividly remembers falling over the first time she put a barbell overhead.  Jess also has a passion working with endurance athletes in hopes of moving them away from traditional long slow distance training.

Jess is a certified Starting Strength Coach and holds Crossfit Level 1, CrossFit Gymnastics and Crossfit Endurance certifications. 

Contact: Jessica(at)

McDowell Myers

Growing up in the Blue Ridge Mountains of Southwest Virginia, the natural environment always played a part in McDowell’s fitness. After a childhood and adolescence of playing whatever sport was in season, he found himself bored in regular gyms. This led to an interest in boxing and various outdoor activities, whether it be competing in mountain bike races, road cycling, or simply running on the mountain trails.

McDowell discovered CrossFit at the beginning of 2008, attracted to the challenging workouts and intrigued by the varied programming posted on the main site. Without a CrossFit gym in town, he created his own home gym, complete with homemade pull up bars, medicine balls, and a barbell rack--all while reading and studying movements online and in books. In April of 2011, he completed his CrossFit Level 1 Trainer Course.

In June of 2011, McDowell arrived in Brooklyn and began taking classes at CFSBK. He immediately connected with the gym community and the friendly competition it provided. Today he spends more hours than ever at CFSBK, and continues to enjoy the journey as a coach.

In addition to CrossFit Level 1, McDowell is CrossFit Powerlifting and CrossFit Kettlebell Trainer Certified.

Contact: McDowell(at)

Melissa Loranger

Melissa’s passion for sports and fitness began early in life while running from one activity to the next in the suburbs of CT; from soccer and softball to track and ballet. She came to CrossFit in January, 2010 after feeling beat up, worn out and generally bored with the same old cardio, “bis and tris” gym routine. After one Teaser Class, she knew that she had found the challenging and exciting fitness regimen she was looking for.

Since that initial introduction, Melissa has seen gains in skill and strength and continues to focus on improvement. She has used CrossFit to train for several adventure races, half marathons and team relay races. She has participated in the CrossFit Open Sectionals from 2011 - 2015 and continues to compete in local CrossFit competitions.

Melissa enjoys sharing her passion and excitement for fitness with others. In particular, introducing individuals to the vast array of constantly varied movements utilized in CrossFit and helping people set and meet fitness goals they never imagined possible. She completed her CrossFit Level 1 Trainer Course in May, 2012, completed the CrossFit Gymnastics Trainer Course in December, 2012 and became a Starting Strength Coach in April, 2013.  Her appreciation of physical movement and rehabilitation led her back to graduate school to pursue her doctorate at Hunter College's Doctor of Physical Therapy program (Class of 2016).

Contact: Melissa(at)

Arturo Ruiz

Arturo comes to CFSBK with 5 years of training experience working with diverse populations in individual and group settings.   He holds a CrossFit Level 1, CrossFit Powerlifting, CrossFit Movement and Mobility, NASM CPT and NASM CES certifications.  He has also attended the California Strength Olympic Lifting seminar.  He prides himself on continuing education and changing peoples lives through fitness.

Arturo's fitness background stems from the competitive and recreational aspects of Mixed Martial Arts (MMA).  Strength and Conditioning has always sparked his interest and once he was introduced to CrossFit, he quickly realized that he had found his new passion.  Since then, he has used CrossFit to prepare for several amateur MMA fights, amateur Muay Thai fights and NAGA tournaments. He has also participated in the 2012 CrossFit Open and many local CrossFit competitions.

Contact: Arturo(at)

Whitney Hubbard

Whitney's love for movement started early in life. She began ballet at the age of three and went on to participate in (and occasionally win) national dance competitions throughout her teens. This passion continued into her college years, and she received her BFA in Dance from the University of Illinois. It was there that she first studied anatomy and kinesiology, as well as started a yoga practice.

Her first CrossFit experience was in the fall of 2009 when she took a class with David... and couldn't walk down stairs properly for three days afterward. Having always been active but never lifted any weight, Whitney spent a good amount of time afraid of an empty barbell and only dreaming of getting a strict chin-up in another life. Her goal as a coach is to inspire people to lay a safe, consistent, and sound foundation in their movement and to build a lifestyle of health and strength.

Whitney teaches Yoga for Athletes here at CFSBK, as well as alignment-based vinyasa at other studios in Brooklyn. She also loves to surf. And eat fish tacos.

Whitney is a certified Starting Strength coach, a Level 1 CrossFit Trainer, and a Certified Yoga Teacher (CYT-200HR).

Contact: Whitney(at)

Jessie Brown (“JB”)

Jessie grew up very active. She was a semi-competitive swimmer in high school, and in college at UC Berkeley, she joined the triathlon team, went rock climbing, practiced yoga, and was a regular at nightly cardio kickboxing classes. It didn’t take long for her to realize that she was passionate about sharing her enthusiasm for fitness with others, and, in 2009, she began teaching group classes at mainstream gyms in the San Francisco Bay Area. Jessie found CrossFit at CrossFit East Bay in Oakland, CA when the craziness of graduate school (also at UC Berkeley) began to wear on her. She was immediately hooked by CrossFit’s intensity and community. She quickly gave up most of her other athletic pursuits, and earned her Crossfit Level 1 certification in January of 2013.

In addition to her L1, Jessie has specialty certifications in CrossFit Mobility and Powerlifting, is an NASM Certified Personal Trainer, and holds a Masters in Architectural History (which she doesn’t currently use in any directly applicable way). She relocated from Oakland to Brooklyn in the summer of 2014, and was quickly won over by the cute dogs, friendly people, and good coaching at CFSBK.

Contact: JB(at)

Katie Harper

Originally from Columbia, Maryland, Katie has been involved with team sports for as long as she can remember. A few months after earning her B.S. in Kinesiology from the University of Maryland in 2012, while applying to physical therapy programs, Katie discovered CrossFit at a small affiliate in a friend’s garage. Despite the freezing barbells and need for space heaters during the chilly winter months, the unique sense of community mixed with a competitive atmosphere were enough to keep her captivated.

Katie has always known she wanted to work with athletes, and she landed a spot in the Doctor of Physical Therapy program at LIU in early 2013, making the big move to Brooklyn. She discovered CFSBK shortly after we hosted 13.2, and the programming and coaching style immediately impressed her. (Plus, she digs the skull and crossbones.)

Katie finds CrossFit to be the perfect complement to physical therapy, as it accelerates her ability to understand human movement beyond the classroom. She holds a CrossFit Level 1 as well as a CrossFit Movement and Mobility certification. When she’s not hanging at the gym or kickin’ it at LIU, she spends the majority of her time thinking about crab cakes and football, because that’s what Maryland does.

Contact: Katie(at)