Without gyms, people would resort to outdated fitness techniques such as swimming and pushing Model Ts up slight inclines. Celebrate contemporary fitness with today's Groupon: for $19, you get one month of unlimited fitness classes and facility access at Knockout Boxing & Fitness in Oxnard (a $50 value).

Knockout Boxing & Fitness unites guests with kickboxing-centered fitness classes and an array of cardio equipment, free weights, and yoga mats. The gym's trainers coach sweat savants in classes that knock out up to 1,000 calories per session while increasing self-esteem and odds of dominating arm-wrestling matches. Kickboxing and boxing techniques are infused in classes such as the full-circuit KO 360 class, which establishes a ring of workout stations zeroing in on heavy-bag drills, mitt work, and core work, and the KO Sparring class, which teaches fitness-seekers boxing basics through three-minute rounds of drills. For a customized workout, a health regimen is developed to suit each client's nutritional, emotional, and fitness needs in the 10-week Go Girl Go boxing and fitness program.

Gym-goers are also free to fortify physiques with the facility's free weights and workout machines. Guests can thrust muscle-building disks into the air via barbells and take a calorie-burning yet quixotic journey up a never-ending stairway on the gym's fleet of high-quality cardio equipment. The towel service and locker room help ease guests non-noxiously back into everyday life.