21 Day Plank Challenge

If you are looking to strengthen your core as well as do a full body exercise, planks are what you want to do.  Try this 21 day plank challenge starting out with 8, 10 second plank based exercises.  Each day you will complete the same 8 exercises but increase your time by 1 second.  Download the full 21 day guide that includes the following:
 
Printable 21 day guide to track each day
Full outline of total minutes per day you've completed
Section to track your starting/end  weight and waist measurement
Images of all the exercises