Need a quick ab burn? This routine is great for when you are in a hurry or just want to get in an extra workout. When performing the moves, focus on maintaining proper form (especially keeping your lower back on the floor when on your back), and remember to breath.  Inhale when you go back and exhale when you crunch or reach up.

10 crunches 
20 ankles reaches
10 toe touches 
20 bicycles 
30 second plank (on the last set, hold as long as you can) 
Repeat 2 more times with no more than 30 seconds rest in between

See video below for overview on how to perform each move.