Golf is a sport of physical precision and aerial dynamics, won and lost upon the pendulum of your swing. Use today's Groupon to brush up on your golf physics and practice blasting balls with your refined stroke. For $30, you get a 30-minute video swing analysis (normally $50) and large bucket of balls ($10) from Par Breakers Golf Academy, a $60 total value. This comprehensive indoor golf facility is a short 30-minute golf-cart trip from Philly in Oaks.