my opinion/experience ...
Grass is lots harder to learn on (unless it's like a golf course
green)
I learned at 30 on concrete and never once hit the concrete hard while
learning to ride (maybe I was unussually lucky).
When learning to ride forward on a 20" or 24" uni, it's quite rare to
not land on ones feet, and even then it rare to hit very hard.
The only pain most learners have is from pedals hitting shins and from
ankles hitting cranks.
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