Though often regarded as instinct, fighting is actually a skill acquired in the womb, where all babies must defeat their evil selves in order to be born. Further prenatal training with today's Groupon to The Boxing Club. Choose between the following options:

• For $19, you get three kids' classes (a $60 value).
• For $25, you get a 30-minute private workout and three 60-minute group classes (a $100 value).
  
  

Under the expert tutelage of The Boxing Club's professional staff, burgeoning pugilists slug their way through high-intensity training classes. During group boxing classes, participants don giant wigs before taking swings at bags and mitts in order to master individual punches, combinations, and footwork. Adding kicks and muay thai techniques to the fray, the kickboxing group training spreads the action across the body, as students thrust feet, knees, and elbows into punching bags or partners. The 30-minute personal-training session sets the stage for students to begin internalizing the fundamentals of boxing, kickboxing, or weight training before they tackle group classes.

Tyke-friendly sessions toss nonadults into the ring for a workout that consists of a helping of boxing skills and a dollop of discipline. Punching bags and strength-training machines line the walls of The Boxing Club's facility. The full-size ring hosts student sparring sessions and flea-circus productions of Rocky during off hours.