I have one lawn customer that I mulch their flower beds, 8 yards of mulch. Did that Monday, was planning on doing about 5 hours Monday and the rest Tuesday, then heard rain all day Tuesday, so I pushed through and got it done Monday. Hurt till this morning. I have so many saws that if one doesn't start right up, I put it down and grab another. I found that pulling the starter on a saw, or my splitter, puts more strain on my back than lifting. I hurt my back a few months ago and couldn't figure what I did. Then I picked my splitter up from the shop, and realized I had snathced and snatched on it the day before my back started hurting. Turned out I had water in my fuel. I counted and I pulled 25 times and got a couple little sputters, rested a minute, and pulled 25 more. Did that 5 times and said "off to the shop you go". All that pulling had me down for a solid week, and sore for 2-3 weeks. Can't wait till I stop getting old!