I'm doing better on the slackline these days.
I find my balance is better if I hop on the slack line after a run.
I wonder if that is because my muscles are all warmed up.
The only problem with stringing the slack line between two black walnut trees are...well, the black walnuts. I fall off the line and step-squash! right onto that nasty black hull. So my slack line has walnut stains on it.