>>2704560>just for calves, hamstring and lower backYou should stretch your quads, glutes, and adductors, too.
I find this stretching routine to be a good baseline that hits all the important muscles and I do it every day that I'm active:
http://www.startbodyweight.com/p/simple-static-stretching-routine.htmlI also like to add in pic related hip flexor stretch and reaching down to my toes.
I tend to have the most difficulty stretching out my lower back so I could probably use tips on that myself.