10 rounds, each for time of:
Hill sprint or stairs
Find a big hill or set of stairs with a distance/incline that allows for approximately a 20 second effort.
Rest 90 seconds between each effort.
Post experience and times to comments.
Scaling:
If you are unable to find a hill or set of stairs, complete 10 100-meter sprints or 20-second intervals on a stationary bike for total calories.