Though canines love tennis for its bouncy yellow balls, humans appreciate the freedom to bark loudly with each swing and bury their favorite rackets all over the court. Become a tennis beast with today's Groupon: for $45, you get six one-hour group tennis lessons at Force Indoor Sports in Rocky River (a $90 value). Using its intuitive USA Tennis 1-2-3 program, Force's experienced instructors tutor tennis neophytes of all ages on the basics of the game in a fun, active, and encouraging group environment. Head to Force's turf-lined facility, which boasts five indoor tennis courts, and your instructor will cover the basics on how proper strokes, seamless strategies, and well-timed foghorns can strengthen your game. The social atmosphere of the introductory lessons also makes for a fine setting to meet fellow thwackers or enlist potential playing partners.