hole saw bit

You can easily make a safety squat bar using a set of straps. Simply take two lifting straps/wrist straps, loop them onto the barbell, space them an equal distance from the center knurling (similar to the setup used for front squats with wraps), and voila, you have your safety squat bar. This makeshift safety bar squat setup can easily be employed on good mornings as demonstrated by NFL defensive tackle, Lawrence Virgil. In fact, I've found that many of my larger athletes prefer this setup for good-mornings as it doesn't require that same degree of shoulder mobility and flexibility as standard good mornings do. Many lifters are unable to keep their shoulders retracted and depressed when performing good mornings, which not only makes them ineffective for taxing the posterior chain, but they also become exponentially more dangerous on the spine, shoulders, and neck. However, the neutral shoulder position reinforced by the makeshift safety squat bar eliminates this issue. As a result they're much more effective in keeping ideal spinal positioning and postural alignment, not to mention being highly effective for crushing the glutes, hamstrings, and spinal erectors. – Joel Seedman, PhD