I’m in pretty good shape for an HVAC tech. I workout each day, do daily yoga, and eat a clean diet. Yet when I work a lot outside on the HVAC AC compressor, like I have been doing the past week, my 55 year old body feels pretty sore. My lower back is doing okay though thanks to all of the yoga I’ve been doing over the past 12 years. I highly recommend doing yoga each day. Just start with one minute a day for a week and then go to two minutes a day for a week and so on up to 15 minutes. I had to work on the HVAC system the other day and was bent over for long periods of time but my lower back was fine the next day. Just do one pose and hold it for 30 seconds then switch sides and do another 30 seconds and build from there. I had to clean the ductwork a few months ago, which took me all day and involved a lot of bending over and lifting, yet I had no pain in my lower back at all the following day. Before doing yoga I would be using ice and painkillers the next day because of all of the pain. Sorry if I sound like I’m preaching. I taught it to my HVAC company owner friend and he told me it is the best thing he has ever done for himself, so it isn’t just me who thinks it is great. I am going to replace the heat pump this week and don’t have to worry about back pain afterwards, thanks to yoga!