Without America's favorite pastime, America's favorite marriage proposal—scrawling "Marry Me" onto a baseball and throwing it at a JumboTron—would never have been possible. Propose your love for tossing spheres with today's Groupon: for $40, you get a 30-minute private baseball or softball lesson (a $60 value) and 30-minute cage rental (a $40 value) at Diamond Nation in Flemington (a $100 total value).

With a baseball training academy led by MLB player Jack Cust and a softball training center led by Olympian Jennie Finch, Diamond Nation hosts a staff of professional players and coaches who cull their collective NCAA, MLB, and Olympic experience to refine the hitting, pitching, and fielding skills of burgeoning legends. The Jack Cust Baseball Academy and Jennie Finch Softball Academy share a well-equipped space and employ staffers who personalize player instruction.

By endowing people with a better understanding of their playing style, participants leave better equipped to self-coach during games and sibling brawls. Players have room to spread their ball-repelling wings while practicing on both indoor and outdoor facilities spanning 63 acres, including the 140,000-square-foot HealthQuest Sports Dome—the largest air structure in the nation covering the HealthQuest Park from November–March and doubling as an Epcot Center impersonator the rest of the year.

An hour in the batting cage post-training session gives future Babe Ruths and former Michael Phelpses a chance to lock in newfound swatting skills. 11 full-size batting cages come equipped with pitching mounds and L-screens for concentrated work on player mechanics.