Glute/Hamstring Firing

First thing I would do is start by stretching on an exercise ball face down just relax and let the low back stretch out. Do this several times a day for 2 to 5 min at a time. This will eventually stretch out the lower disks. While on the ball externally rotate the foot and fully contract the glute before lifting the leg. This puts the hamstring at a mechanical disadvantage so the brain will use the glute as the primary mover before the hamstring. Also just practice tightening your glutes and relaxing them over and over anytime during the day. This can be done sitting or standing. Then do one at a time. Your brain has forgot they are there. Another trick is to slap your butt/ glute hard enough to sting. Surface stimulation increases brain awareness to the underlying muscles.