Maniac I know how you feel, I used to do contract work for the local natural gas company in the eighties and crawled under houses and in attics all the time. Fast forward twenty five years and its time to do a little pm on our furnace, I spent the better part of the morning under the house replacing a few things and cleaning things up. My knees are really sore, there is no way I could do that everyday now. Back in the eighties I would do plumbing and electric during the day and work second shift at my job at the distribution center, I did both for seven to eight years.