Like an antique set of fine china, karate skills are attained with the hope they will never be used. Arm yourself with both readiness and restraint with today's Groupon: for $35, you get one month of mixed martial arts and kickboxing fitness classes at Katsujin Budokai (an $80 value).

Katsujin Budokai's experienced sensei Walt Bushey wields 32 years of martial-arts experience under his 5th-degree black belt, and he uses his extensive knowledge to lead students in the art of full contact self-defense. The one-hour classes teach students proper techniques for pendulous kicks and impeccable timing as they spar with classmates and bullying heavy bags. A tactical flurry of takedowns accompanies the basics of grappling, submissions, and defense with each MMA class. Ideal for toning up saggy torsos, many students utilize the kickboxing course for its fitness and self-defense benefits. Katsujin Budokai wields a house MMA team for those seeking an organized platform for further training. Check out the dojo's flexible schedule, which ensures enough slots for a slew of up-and-coming combatants.