How about day to day work
In the kitchen?
Using cutlery "in reverse"
Probably counts as well
What about
Writing?
Drawing?
Painting?
Like we started out as kids
Coloring book
But take it on
With the weaker hand
Sometimes
1 crayon in each hand
And alternating
For direct comparison
Writing
Both hands
At the same time
Parallel or mirror
Maybe
Good for the brain too
To write in the
Other direction?
Progress markers
Decrease of required effort?
Things softening up?
Along the kinetic chain?
How tight is everything
In the wrist, arm, neck?
Compared to the result
On paper?
Next
Upside down
At least
The writing :P