This four-minute miracle drill burns major calories both during a workout and after.
In an Auburn University at Montgomery study, participants who did eight rounds of all-out jump squats burned 13.4 calories per minute.
Not only that, but they also doubled their post-exercise metabolic rate for at least 30 minutes.
The protocol calls for 20 seconds of hard work separated by 10 seconds of rest.
That means eight rounds equates to roughly 2 minutes and 40 seconds of total work.