How to Engage Your Core for CrossFit by CrossFit Fibre | Feb 20, 2016 | Fibre Tutorials, Strength | 0 comments We lift pretty heavy in CrossFit. That means we need to keep our core engage for a lot of out lifts. Here is a quick video of how to engage the core to make sure you do not injure your back when you are lifting those heavy weights. Submit a Comment Cancel replyYou must be logged in to post a comment.