Memorial Day Murph
Run 1 mile
100 pull ups
200 push ups
300 air squats
Run 1 mile
(41 mins 50 secs)

Can't take a rest day on Memorial Day!  Second year in row I've done this workout.  This one is more mentally challenging than anything.  About half way through the pain really starts and everything in your body is saying stop, but you need to push yourself through the pain and doubt and just keep going.