Your problem is probably that you're trying too hard. It's better to be
relaxed than tense, and it's better to be strong than fatigued. If
you've gotten 70 feet, you're pretty close to having it all; you just
need to let it come to you.
If you've done 15 hours in a week, you've probably had some pretty long
practice sessions. As your body gets tired, your technique
deteriorates and it gets harder to do anything. And if you go back and
do it again the next day, your muscles are probably not recovered from
the unfamiliar work the day before.
I would advise taking a couple of days off, then going back and
consciously thinking about relaxing, putting your weight on the seat,
looking at the horizon, and see what happens.
An important skill for learning anything on a unicycle is the ability
to overcome frustration.
--
tholub
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