A common CrossFit expression goes something like: โ€œYou donโ€™t need harder workouts. You need to hit your workouts harder!โ€

This is a mantra that appeals to Brent Fikowski, who took second at this yearโ€™s CrossFit Games. โ€œThe more complicated and technical a workout becomes, the more opportunities there are to rest and hide,โ€ Fikowski says. โ€œSimple workouts are the most effective, and your effort will provide the results.โ€

If you want to wreck yourself quicklyโ€”weโ€™re talking a full sweat, redlining heart rate, and aching muscles you can easily do in a lunch breakโ€”try any of the following CrossFit workouts.