Repositories are awesome, and we should have more of them.
I recently completed BJ Fogg's Tiny Habits, and it's a pretty lightweight way to install new habits (recommended). However, I realized I could use a better repository of useful habits.
So, please use this thread to suggest habits that you've found useful. Bonus points for evidence/anecdata of usefulness.
Obviously, 1 habit per comment makes upvotes a clearer signal of collective approval.
There is a plugin, at least for mac to speed up all of them. You can also download the vids and use vlc or something locally.
Update: I learned that if you want to watch youtube videos sped up and don't want to download it and play it back, Vlan supports copying the url and ctrl v on to the main screen.