Before martial arts, humans had no choice but to use an ancient implement called a saw to split their wood planks and slice their brick cakes. Give power tools a break with today's Groupon: for $25, you get one month of self-defence classes at In Charge Self Defense (a $50 value).

In Charge Self Defense combines numerous martial-arts styles into an empowering, beginner-friendly approach to women's self-defence. Eager grasshoppers will be tutored in In Charge's self-defence method, which synthesizes techniques from martial-arts disciplines such as tae kwon do, kickboxing, and Krav Maga. Resourceful instructors also integrate movements from yoga, Tae Bo, and Pilates into the training. With classes designed to accommodate all ages and athleticisms, In Charge can help nearly anyone protect themselves from attackers, attackers wielding weapons, and best friends looking for someone to help them move. A level three NCCP-certified instructor, with more than 16 years of experience in martial-arts and self-defence study, teaches all classes at In Charge, which are held twice a week on Mondays and Wednesdays from 7 p.m. to 8 p.m. Private classes for groups and individuals are also offered.