One cycle of HST i would get to the bench exercise and would have a headache in the back of my head/neck. I would finish the rep and it would go away until i started my next set. then i could go on with rest of my cycle for the day with nothing more happening. I made a post because of it and people said it's my breathing. This time my cycle i am having the same problem but i am in so much pain i can't finish my workout. I am pretty sure it's not my breathing at all. any suggestions, of course i am going to see a doctor. just wondering if anyone else had this problem.