Why CrossFit ERT?

Community. Is. Everything.

Hands down, the most important aspect of any CrossFit box is the Community. Inside our walls, you will meet some of the most amazing people you will ever know and may have never had the opportunity to meet otherwise. The community aspect of CrossFit is what motivates us and keeps us coming back day after day. People from all walks of life call ERT home. Firefighters, police officers, military, students, soccer moms, doctors, nurses, teachers, real estate agents, and grandparents (among others) workout at ERT on a daily basis.

CrossFit ERT is a family affair. We are family. We bring our at-home families with us to interact with our gym family. It is not unusual to see kids stretching alongside their parents after a difficult WOD. It is also not unusual to see members sitting around chatting after class, while their kids ride bikes in the back lot. We encourage family interaction through fitness. We work hard and we play harder. We raise money for the causes important to us through “Heroes Are Human”.

We do business together. We support each other and we push each other to achieve things we never thought possible. This is not a gym where you’re just a number and no one knows your name. The people here genuinely care about each other. Yes, you’ll get a great workout at ERT, but your new friends will help you take your fitness to the next level. Guaranteed. ​ ​ Welcome to the #fitFAM! ​

Welcome to the #ERTfitFam!

JON CORNELISSEN owner/head coach

Jon was first introduced to CrossFit in 2013. He is the founder & head coach at CrossFit ERT. Simply put, CrossFit ERT is Jon’s passion. He works hard day in and out to ensure member enjoyment and satisfaction. Whether it be reaching a fitness goal, hitting a PR, completing your first WOD unbroken or competing in your first competition, Jon is there to encourage, motivate and congratulate. He strives to make every visit to ERT fulfilling and meaningful for every single member, every single day!


  • CrossFit: Level 1
  • CrossFit: Level 2
  • CrossFit: Weightlifting
  • CrossFit: Mobility
  • CrossFit: Scaling
  • Ontario Weightlifting Association Coach-In-Training
  • Advanced Medical First Responder & Emergency Medical Responder


Becca first made the decision to try CrossFit in early 2015. The similarities between a CrossFit workout and aspects of her job as a professional Firefighter keep her motivated and coming back for more. The overall atmosphere, personal/team achievement goals and the camaraderie are her favourite aspects of the sport. She thrives on members achieving personal goals & accomplishments and is always one of the biggest cheerleaders in the gym.


  • CrossFit: Level 1
  • NCCP Level 2 Certified Gymnastics Instructor
  • NCCP Level 3 Technical/ Level 3 Theory Gymnastics Instructor
  • Pre-Service Firefighter Program (Georgian College)
  • Bachelor of Arts Degree – Psychology (Laurentian University)
  • Certified Emergency Medical Responder (CPR/AED Level HCP)


Denise is a movement enthusiast and began her journey into CrossFit in 2015. Her philosophy is that everyone is an athlete and that you can accomplish more for loving your body for what it can do, instead of what it can’t. She has a desire to inspire, she is an avid cheerleader of body love and acceptance and promotes health honesty and inclusivity in her practice. She truly believes that “you’re stronger than you think.”


  • Certified Vinyasa Yoga Instructor
  • PaddleFit Core Certified

MATT SPENCERCoach & Nutrition Coach

Matt’s journey into CrossFit is no different than yours. Starting out as “wanting to get in shape for summer” he wasn’t planning on staying with CrossFit for long. That was 2012 and he hasn’t looked back since. After pursuing a career down south, Matt soon realized helping people be their best through CrossFit is all he wants to do. He likes to geek out over movements and Nutrition while making sure to have fun along the way. Friendly and approachable, Matt can’t wait to help you reach your fitness goals.


  • CrossFit: Level 1
  • CrossFit: Level 2
  • Crossfit Judges Course: 2018
  • Precision Nutrition Certified Coach (Pn1)

Samantha pereira da silva: coach

Samantha first discovered CrossFit in 2014 while completing her Bachelor of Science in Kinesiology from the University of Guelph-Humber. She was always involved in many sports growing up, but it wasn’t until she found CrossFit that she truly found her passion. Samantha is known for her upbeat personality in every one of her classes, and really focuses on helping her athletes move safely and efficiently throughout all movements and skills they learn.


  • CrossFit: Level 1
  • CrossFit: Scaling
  • Personal Training Specialist CanFitPro Certification
  • CPR & First Aid HPC Certificate
  • Fitness & Health Diploma (Humber College)
  • BaSc. Kinesiology (University of Guelph-Humber)


  • Crossfit Journal
  • Crossfit ERT
  • Heroes Are Human