As he grew, he didn’t have enough time to coach everyone one-on-one, so the CrossFit group class was born. Thankfully, the group class setting works for 90% of a CrossFit gym’s population. Additionally, CrossFit has done such a good job of standardizing movement that an educated and experienced CrossFit coach can run a group class while providing everyone personal attention. We often say a CrossFit class is personal training in a group setting.