The cable cutter didn't weigh much, so it only made it about 70% of the way down the line, but that was a good sign that a human would not go flying at 100 mph into the tree at the bottom. So, the next test was to strap on the harness and do a line stretch test at the landing zone to make sure that the line wasn't just going to dip and slam the rider into the ground. I connected myself near the end of the line and my brother pushed me up-hill a little ways. I bounced around to be sure it was going to hold, and it looked pretty good. I was ready for the first run!