The Second Amendment informs you that You are Necessary for the Jurisdiction of Your Government (The People's).
>..militia, being Necessary... the people to keep and bear arms...
Get trained, help train those around you, practice, and be prepared that, without warning, you may need to act to keep Peace and Order, even where enemies lie "It's not your Right, we have professionals."

100 pushups in a day. 100 crunches/situps, 300 jumping jacks, 1 mile ran, 4 miles jogged, at least every other day.