Before the popularization of kickboxing, bags lived relatively peaceful lives containing potatoes, schoolbooks, and earnest attempts at self-portrait bobbleheads. Invigorate cloth containers with today's Groupon: for $35, you get five kickboxing classes at Danny Daniels Fitness Studio (a $75 value). Helmed by a kickboxing champion with 25 years of martial-arts experience, Danny Daniels Fitness Studio takes on fitness with the focus of an expert fighter. Kickboxing combines the upper-body impact of Western boxing with the Eastern kick of martial arts to serve participants a potent cocktail of endurance training and stress-relief. The studio's accommodating schedule makes it easy for participants to increase their flexibility, strengthen every muscle group, gain confidence, and shed extra pounds and boring afternoons with 45- to 60-minute classes offered in women's, men's, and co-ed formats. This Groupon is also valid toward Danny Daniel’s mixed-martial-arts classes.