You should do the Unlock Your Hip Flexors exercises everyday and if you want faster results, do them twice day. The follow along video is an excellent warm up drill, but more importantly, aids in correcting proper length to your hip flexors.
The best results come from actively engaging the glutes and core while doing the stretches to prevent any unnecessary lower back movement. You want to do more, just “go through the motions.” Follow these instructions each time you perform the movements. http://exercisesforinjuries.com/3-tweaks-to-help-protect-your-back-from-back-pain/.