DO NOT do this exercise if you are a beginner. This exercise needs to be executed carefully and preferably with a spotter. Even the most experienced weightlifters are super careful when they do this exercise and try to avoid doing it if they don't have a reliable spotter standing behind them to shadow their every lift.
This exercise is a great exercise to add to an already existing chest workout routine that is stale and in need of some variety. The key to performing this movement is in the steady pace. Because of the danger factor (impact to windpipe) it's also an exercise that needs to be executed with absolute precision.
Make sure you lower the bar as close to your neck as possible and try to push up as strong as you can. Before you start doing this exercise we suggest doing a few practice repetitions with the empty bar first so that you can get a feel for the mechanics of the movement.