I am a big fan of crossfit. It's a great way to work a bunch of different muscles at the same time. When I workout, I like to keep it simple; meaning repetitive moves. This way, I can do anytime and anywhere. My favorite are the routines are the "AMRAP" (As Many Reps As Possible) routines. I find they are very motivation. Bellow is a favorite of mine, along with a simple 7 rounds routine.
This first one is the AMRAP routine.