Here’s an unpopular truth: We, as lifters, do way too much work in the sagittal plane (or the anatomical boundary that separates the left and right portions of the body).
The sagittal plane is responsible for forward and backward movement, meaning all of the popular and important lifts occur in that plane — squats, overhead presses, deadlifts, lunges, pullups, and rows all fit the category. With that said, building a general baseline of athleticism is all good and proper, but failing to address other areas of our athleticism through loading different planes of motion will end up catching up to us — either in the form of a stalled physique, or in the form of an injury due to imbalance.