I did have the opportunity to help my Dad saw up some logs with a cross cut saw when I was very young. You really had to be careful to keep your legs away from the blade, they could remove a lot of meat fast and deep in one stroke. About all I could do was to drag it back with very little cutting while Dad let it fall into the wood and pulled it hard, but it was still better than him having to push it back which doesn't work too well. I saw one neighbor who had no children use a bicycle inner tube hooked on the saw handle to pull the saw back. That worked but doubled the effort to pull the saw toward you.
You had to have strong arms and strong back to use them very long but they sure beat the heck out of chopping down a tree with an axe.