It’s hard to argue the San Diego CrossFit scene isn’t thriving. Even if you’re new to the exercise routine and need a primer on how it works, you’ve still probably heard about its growing popularity. From Crossfit Sun in Carmel Mountain Ranch to Mighty Crossfit in the Midway District, some of the best gyms in San Diego are adding members by teaching the principles of the intense functional-fitness method. Of course, some San Diego gyms do tweak the formula a little. CrossFit Suspension, for instance, mixes in plenty of TRX training on top of the regular CrossFit workout.