Not only is an at-home workout excuse-proof, since it’s free, it will only cost you calories! Check out this full-body circuit workout that fits in your living room. It takes about 20 minutes to do, and other than a chair, it requires no props. Instructions: After warming up with light cardio for five minutes, repeat each three-exercise circuit twice, resting for 60 seconds after completing one rep of an entire circuit. Click here to download a PDF of the workout that you can print. It looks best printed in color and fits on one page. Hang the workout up on your fridge to remind yourself to work it.