Stronger, Faster, Dirtier*

*Not to mention sweatier, kickier, muddier, bendier, pointier, wackier, outside-the-boxier, punchier, stretchier, modified-arabesque-ier, occasionally spendier, but worth every penny for: a healthier new you. (Your body can thank us later.)

12/31/2013, 5:00 a.m.

This type-A town has always had a thing for in-your-face intensity. We like our sports teams fierce, our driving fiercer, our arts and letters cranked up to 11. It was only a matter of time before our getting-in-shape gambits got turbocharged, too. Boston, it seems, has fallen hard for extreme fitness. The six regimens that follow are more than just trendy—they’re also highly effective, guaranteed to get you into the best shape of your life. —Edited by Alyssa Giacobbe and Melissa Malamut, photographs by JJ Miller, additional reporting by Megan Tripp and Jamie Ducharme

Check out all six workouts below, or first take our Fitness Fad Primer to find out which workout is right for you.