was it anything specific in your technique. I believe my technique is alright, but one never knows how one picks up wrong things without realising. I will review my technique once again, but I feel fairly comfortable saying that it might not be a problem. However, overtraining can definitely be one. I have been doing KB strong phase 1 back to back . the first 10 or so days the volume is quite less, but it picks up quite quickly after that, especially when sets of 3 start and sets of 2 is stabilised at 10. I did 17 days back to back before I decided to take a break, so that's a lot of volume without rest, using my 5RM. I was feeling alright, until I wasn't. Someone did mention that it can be a bit hard on the body, but of course I had to experience it myself