When riding, I get severe cramping under/below my ribcage on the left side almost exclusively when doing the sitting trot, it usually starts within a few strides of sitting. If I return to posting, it will slowly go away. This hasn't always been the case, I don't recall this ever happening before the past week. Nothing has changed between last week and this one other than the appearance of these annoying cramps. I don't hold my breath while riding ( I made sure I WAS breathing before trotting & during, but the cramping is there anyways) and I am well hydrated.
Does this happen to anyone else, or does anyone have any insight as to what the cause is?