Bootcamp trainer Scott Colby, known as "The Abs Expert," offers free group classes every other Saturday morning at the bleachers and track at SMU's Westcott Field. In 45 minutes, Colby leads a grueling but doable workout that includes bleacher-running, push-ups, skipping, jogging, crunches and squats. The intense routine works the whole bod and leaves even the fittest participants ready to flop. Then Colby and crew head to a nearby juice joint to do a little socializing. Some 244 members have signed onto the free Meetup group, but there are usually around 20 to 30 who show up regularly. Beginners and newcomers are welcome, and Colby will help modify all the moves for first-timers. Bring water and a willingness to sweat, and in under an hour you're that much fitter. And for free!