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Below are all the certified trainers that will coach you through all the movements and classes.

John Wallen


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Co-owner and trainer John Wallen began CrossFit training in 2009 after becoming bored with conventional weight training. He began performing main site WODs and instantly became hooked. Wanting to take his training and coaching to the next level, John became a CrossFit Level 1 Trainer in 2010 (working with instructors, Rob Miller, Todd Widman, EC Synkowski, and Heather and Ben Burgeron) and a CrossFit Level 2 Trainer in 2013. John has trained with many of the best CrossFit and Olympic lifting coaches in the area and brings a wealth of knowledge to our box. John is a huge proponent of proper form in all of our lifts and movements. Accordingly, he is a CrossFit certified judge and was a judge in the 2013, 2014, 2015 and 2016 CrossFit Open and the 2013 and 2014 CrossFit Games Mid-Atlantic Regional Competition. John is a frequent Masters Division competitor and has won multiple local CrossFit competitions. When not coaching at CrossFit Thunder Hill, John is an attorney and banker who has worked with over eight different CrossFit boxes in various capacities.

– CrossFit Level 2 Trainer (August 2013)

– CrossFit Level 1 Trainer (July 2010)

– CrossFit Olympic Lifting Trainer (June 2013)

– USAW Sports Performance Coach (March 2016)

– 2013 & 2014 CrossFit Games Mid-Atlantic Regional Judge

– 2013, 2014, 2015 & 2016 CrossFit Games Open Judge

    Jill Wallen


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    Co-owner and trainer Jill Wallen was first introduced to CrossFit by her husband John, in 2009. She officially became a CrossFitter in 2011 when she joined a box. She loved the intensity of the workouts, the ability to use a barbell and the close community feeling. Now years later she is stronger and over 30lbs lighter thanks to CrossFit. Jill became a CrossFit Level 1 Trainer in 2012 under the direction of great trainers including Rob Miller, Aimee Lyons, Rory Zambard (14th place finisher in the 2013 CrossFit Games) and Adrian Bozman, a member of the CrossFit HQ Staff. John and Jill began training people out of their garage in 2012 and moved into their first location in Toughkenamon in 2013. She enjoys encouraging and helping our athletes to be better and do things they never imagined they could do. Jill is a CrossFit Kids Trainer and is excited to introduce CrossFit to kids. She is looking forward to the opportunity to help shape lives and teaching the importance of fitness. As a trainer and now a box owner, she can truly say CrossFit has completely changed her life for the better.

    – CrossFit Level 2 Trainer (September 2017)

    – CrossFit Level 1 Trainer (October 2012)

    – CrossFit Kids Trainer (September 2013)

    – CrossFit Mobility Certificate (July 2014)

    – USAW Sports Performance Coach (March 2016)

    – 2013 & 2014 CrossFit Games Mid-Atlantic Regional Staff Member

    – 2013, 2014, 2015 & 2016 CrossFit Games Open Judge


      Lisa Duncan


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      Lisa was introduced to CrossFit by her husband, Christopher, in October 2011 when they did “Murph” together in their garage. She was very nervous to start CrossFit after doctors told her she would never run again after suffering multiple ankle injuries. Lisa also suffered from chronic migraines. After joining her first CrossFit box in December 2011 she quickly fell in love with the community, constantly varied movements, and the friendly competition. CrossFit has been a life changing success story. Lisa has used the functional fitness program to fully overcome her ankle injuries and is now completely migraine free.

      In November 2012, Lisa became a CrossFit Level 1 Trainer. She is constantly honing her coaching skills and is always ready for the next competition. She has competed on the CrossFit Thunder Hill Competition Team in multiple competitions and is always ready for more. She received her CrossFit Mobility Certificate in July 2014.

      When not coaching or competing in CrossFit competitions, Lisa is a wife, a mother to three cats and two dogs, and a federal employee. Lisa strongly believes in the sense of community that Thunder Hill offers and couldn’t see coaching elsewhere.

      – CrossFit Level 1 Trainer (November 2012)

      – CrossFit Mobility Certificate (July 2014)

      – USAW Sports Performance Coach (March 2016)

      – 2014 & 2015 CrossFit Games Open Judge

        Tony Davis


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        Tony’s first CrossFit workout was very interesting. It took place in February of 2014 and he got CRUSHED in the WOD by his wife, Lisa. Tony began to give CrossFit a shot as opposed to the typical meathead weightlifting when he signed up for the 2014 open. The community aspect and friendly competition had Tony hooked and he became an athlete that showed up every day. He was nervous at first as he has had two surgeries on each knee and doctors have told him no squats, deadlifts, running, etc. With the coaching of John and Jill and the support of the CrossFit Thunder Hill community, Tony’s performance in all of these categories is better than they have ever been and with the proper form, he has no knee issues. After six months of training, Tony participated in his first competition and has recently joined a CrossFit Thunder Hill Competition Team to compete with as well. He became a CrossFit Level 1 Trainer in August of 2015 and is looking forward to helping many others achieve the results they are looking for.

        Outside of CrossFit, Tony is a husband and father of 3 boys (one of which joined CFTH in August of 2015). He is a manager for Wawa, is a middle school leader at Willowdale Chapel, and coaches youth football. Tony loves the family feel of CrossFit Thunder Hill and is thrilled to be a part of the team and to help spread the excitement that CrossFit provides!

        – CrossFit Level 1 Trainer (August 2015)

          Paul Porter


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          Paul was first introduced to CrossFit about 3 years ago after a few friends convinced him to give it a try. He was instantly hooked. He enjoyed the constantly varied workouts and the friendly competition appealed to his competitive side. Paul came to CrossFit Thunder Hill shortly after we moved to our Oxford location. Conveniently, we moved in right next door to where Paul works, Country Chrysler, Dodge and Jeep. It has been a great fit ever since. Now in his 40s, Paul says he is in the best shape of his life. In 2015 Paul decided to take his training to the next level. He enjoyed watching people change their lives and knew he could be a positive force for that change. He earned his CrossFit Level 1 Certificate and began learning the CrossFit Thunder Hill coaching philosophy. He encourages everyone who is not happy with their fitness level to stop in and give us a shot. Paul brings a non-threatening and supportive approach to coaching and praises his fellow coaches’ and athletes’ support and inspiration. Paul frequently competes in various masters and Rx competitions in the area. He and his wife Lisa (who is also a CrossFit Thunder Hill member) live in New London with their Rottweiler Mac.

          – CrossFit Level 1 Trainer (January 2016)

            Justin Stefanosky