Make no mistake. This routine is intense.

Do this circuit 3 times in a row, spending 30 seconds on each move. Be sure to use a sturdy chair that doesn't have wheels.

Try Lauren Kleban’s brilliant on-the-go core workout—and remember, you can do anything for five minutes!

It's time for another quick yet intense workout. It's may only be three moves, but you'll feel your arms, abs, core, and lower body burning. After ...