The posterior chain is extremely important for almost all athletic movements especially sprinting! Every season the lower back is identified as a weak link in a footballers posterior chain, season after season this comes up in testing and is very noticeable during strength training sessions. The good morning is typically an assistance exercise and it should not be accompanied by squats or deadlifts in your programme. This will cause the lower back to be overloaded. Instead add it to split squats and step ups (knee dominant exercises), this reduces the amount of work produced around the hip reducing posterior chain stress.
To perform this exercise:
Begin by placing the bar across the shoulders in the same position as a back squat. Keep your back tight by pulling the bar down into your shoulders, squeezing your shoulder blades together and keeping your elbows under the bar.
The movement starts at the hips, moving backwards with a slight bend in your knees. Maintain a neutral head position, slight arch in the lumbar spine and keep your chest out whilst moving into a position where your chest is just off parallel to the floor.
Reverse the motion by driving the hips forward utilising your lower back, glutes and hamstrings returning to the start position.