Though canines love tennis for its bouncy yellow balls, humans appreciate the freedom to bark loudly with each swing and viciously attack unsavory refs. Hone your skills in the ultimate sport for werewolves with today's deal: for $35, you get a two-hour tennis lesson (a $75 value) at Rhythm Tennis in Russian Hill.

Head down to Rhythm Tennis's three outdoor courts in Russian Hill Park for your lesson with Coach Greg. If you want a private lesson, the lesson will be one on one; if you prefer learning in a group atmosphere, the lesson will be conducted in a group of no more than five people. Schedule a lesson at the same time as friends or bitter enemies, slug it out with strangers, or fly solo—it's up to you. The lesson itself lasts for two hours and is ideal both for beginners looking for an orientation in the sport and old hands that need brushing, shuffling, and whacking up. For those who don't possess a quiver of rackets, equipment will be provided. For those with rackets that are imaginary or could use some fine-tuning, discounts on new rackets and restringing services will be available for Groupon holders.

Tennis is a cardio-intensive workout—a fun and productive way to release aggression on the hides of stoic tennis balls. Coach Greg is a certified and experienced instructor who will help make your two-hour lesson both enjoyable and useful. Whatever your motivation for grabbing the racket, Rhythm Tennis will make the experience worth your while.

Reviews

Rhythm Tennis's Coach Greg has earned a four-star rating from Yelpers:

• Just finished my 3rd lesson and I'm amazed at how far I've come so quickly! Greg told me that I'm already hitting some pretty advanced shots. – Daniel M.
• I received a gift of 5 tennis lessons for the holidays and I've had two so far with Greg. I've been happy with him overall. He really focuses on the mechanics with me and has revamped my style. – Brian B.