I have a lot of trees in my front yard, mainly Oaks and Blackjacks. I wanted to take several out, so my son and I started at 9:30 this morning and finished at about 7:00 tonight. Took out 7 that were all between 25-30 feet. I have run the saw so long today that my arms keep cramping and I can't straighten them and my back is feeling it as well! I have a bad feeling about tomorrow morning!