Do this static stretching routine at the end of your core workout. Ab, oblique and lower back stretches to increase your flexibility and release all tension. http://www.spotebi.com/workout-routines/core-static-stretching-exercises/
The Best Back Exercises to look amazing in a backless dress! http://www.spotebi.com/fitness-tips/best-back-exercises-posture-tone-strength/
Stability Ball total body workout! Best stability workout I've seen in a while!
By strengthening the glutes you will be able to perform high-intensity activities and exercises and they will also be extremely helpful for various sports and running. ift.tt/29iAgux