Our experienced, safety-focused coaches offer you the very best in motivation and training, pushing you to redefine your limits while reconditioning your body and mind. They’re well equipped to help you pump up your intensity and recondition your mind and body. Our friendly, growing CrossFit community will meet you where you are, and inspire the confidence you need to keep going. You’ll love the personalized support you receive at every level!

  • Derek Grenfell


    Owner/Coach Derek Grenfell has been CrossFitting for five years and specializes in weightlifting and nutrition. He’s passionate about creating stronger, healthier people that are “harder to kill”—a phrase that comes straight from his favorite quote from Mark Rippetoe: “Stronger people are harder to kill than weak people and more useful in general.” He loves seeing the moment when members realize they are in the driver’s seat of their own health and fitness, and knowing that they can get as far as they are willing to go.

    Derek has spent most of his early life wrestling, competing at the national level several times, and discovered CrossFit while he was in chiropractic school. “It immediately challenged me and humbled me,” he says. “It wasn’t long before I was back in similar shape to my old competition days.” As he began working in his own private practice, he spent a lot of time addressing functional rehabilitation, but had nowhere to send patients once they were discharged from his care. The answer was obvious. “I had to open a CrossFit box as soon as possible, so that the patients I was working with had a place they could get after it and continue to increase their fitness utilizing functional movements.” Since Derek already had a background in coaching and training, he applied to a gym that was converting from regular group training into a CrossFit affiliate. What started as a part-time job to pay the bills while studying, became an absolute passion and he hasn’t looked back since.


    • CrossFit Level 1 Trainer
    • Performance and Corrective Exercise Specialist
    • Doctor of Chiropractic
  • Brandon Schopf

    Assistant Coach

    Assistant Coach Brandon Schopf is passionate about improving the general wellness and fitness in his community. Before becoming a CrossFit coach at CrossFit Armati, Brandon served as a Door County paramedic for 15 years. But seeing what some people are forced to go through on a daily basis because of their unhealthy lifestyle is something Brandon wants to help with. He says, “Through CrossFit Armati, I can help people with fitness, nutritional and motivational information, Hopefully improving their overall physical wellness before they have to use services like paramedics, in home or out of home care.”

    Brandon has always felt the need to be fit and healthy. “I have spent the last 10 years trying everything from running to weightlifting to HIT workouts.”, luckily on his road to fitness he ran into Coach Derek, who piqued his interest by telling him he was opening a CrossFit gym and he hasn’t looked back since. Brandon’s favorite quote is from Jim Rohn and it says, “We all must suffer from one of two pains; the pain of discipline or the pain of regret. The difference is discipline ways ounces while regret weighs tons.”


    • CF-L1
    • EMT-P
    • CPR
    • ACLS
    • PALS


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