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Sure, we’d love to have time for daily mud wraps, 600-page Russian novels and three-hour gym sessions. But the truth is, we work in our self-improvement when and where we can.

Our newest way to sneak in a quick workout: Sworkit, a supersimple, free app for randomly generated exercise circuits.

Sworkit works on a computer, iPhone or Android and functions kind of like an iPod shuffle for exercise. You choose your workout time (up to one hour) and goal (back, core strength, full body, etc.). Sworkit then generates a series of randomized 30-second routines (none of which require equipment) for you to follow, along with handy pictures of what each task--say, a “jump squat” or “V sit-up”--actually looks like. At the end of every 30 seconds, a whistle blows and you’re on to the next exercise.

We recently tried out ten minutes of upper-body work and found ourselves moving from lying triceps lifts to wall push-ups to alternating planks, the result of which was impressively sweaty. Any routine we didn’t like we could skip, and we got a welcome break every couple minutes.

The verdict: not as good as the real gym but a whole lot better than nothing.

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