Heading out the door? Read this article on the new Outside+ app available now on iOS devices for members! Download the app.
In Month 3 of The Ultimate Oxygen Challenge, Erin Stern introduces Tabata circuits to up the intensity and burn more fat.
The idea is to work as hard as you can for 20 seconds, rest and recover for 10 seconds and repeat that sequence for a total of eight rounds, or four minutes.
Watch as she performs her circuit of Burpees, Jumping Jacks, Mountain Climbers, Pop Squats and High Knees in real time!
Are you ready?