I have been taking kickboxing a few short weeks and have noticed something. In the begining of training when doing my dynamic stretches for my Gluteals, adductors, I stand on one leg and raise myleg to the side, knee straight as high as I can and back down. My problem is when I reach the max height with my leg my hip gives a good pop, sometimes on the way back down as well. It doesnt hurt at all but is quite unnerving. Like I said I am quite new to it all and I want to know if this could be cause I have weak hip joints, how to strengthen, is it normal etc. In the gym they say it will go away, anything to make it go away quicker?