Don't listen to Coalstoves! The dude's like, 2 years old according to his profile! He ain't got no bad back!
Remember the old Groucho Marx joke about telling the doctor "it hurts when I go like this" and the doc replies "Don't go like that!"
You're not soldiering or training to be one, so if it hurts, probably should take it off the activity list for a bit.
If you are soldiering, remember the words of Cdr. Richard Marchinko "If it hurts, thou art doing it correctly"