I used to stretch all the damn time when i was a student in the dojo. Now that i'm the guy running the dojo and business demands as well as dealing with students has all but eliminated stretching from my regimen. It has turned out to be a catastrophic bonehead move on my part. I still retain some limberness in the legs but from overall lack of stretching it seems that is the problem with my back right now. Back still good and strong, 1 arm hammer rows for reps with 205, shrugs on shrug machine with 360, etc and back is strong and dense but from not stretching the muscles are so tight and almost shortened if you will so that when i sneeze the force of the sneeze almost rips my right trap off the bone. normal people can sneeze and its like a relief, i get the sneeze is coming sensation and i'm in dread because i know the post sneeze pain is going to bring me to my knees. my low back also gets super tight the day after sparring and drills. need to prioritize the stretching, particularly back to keep limber and pain free. unfortunate lesson learned =(