Learn a Martial art
Start a Hobby
Learn a Martial art
I love this idea from Walt. It is a great form of exercise and anything that can help you stay safe at night is a good thing.
Do the math
Carpentry
Run a side business
Investing
Make it real
Stick with what you know
Gardening
Meditation
Write novels and short stories
Cycling
Camping
Become a caretaker More ...
Test your English Language 
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