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Boot camp exercise classes vary in style, depending on the teacher. But you can generally expect to meet outside, rain or shine. You'll probably spend an hour doing some form of cardiovascular exercise (running, hiking, interval training, or obstacle course challenges), along with strength elements (using dumbbells, exercise bands, or the resistance of your own body weight). You'll also work on flexibility in a stretch portion of the class, which may incorporate elements of yoga or Pilates.

The fitness boot camp class Smith attends in Weston, Fla., is taught by ex-college football player and fitness coach Tom Rayhill. Rayhill's boot camp is offered three times a day, seven days a week, year round. People can pay daily, weekly, or monthly and come as often as they like.

Many other boot camp classes are offered for defined periods of time. John Spencer Ellis' California-based Orange County Adventure Boot Camp, which has locations in nine countries, is offered to women only at 5:30 a.m., five days a week for one month. Many participants re-enlist one or more times.

Boot camp fitness classes challenge the mind as well as the body, instructors say.

"We work on technique, form, core training, breathing, relaxation, and a better understanding of how the body moves," says Ellis. "In four weeks, people will drop 5% to 6% body fat, lose up to 10 pounds, and reduce their mile time sometimes by 2 minutes a mile."

Often, the confidence participants gain in boot camp class helps them take control of other aspects of their life, Ellis says.

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