The greatest Rock 'Em Sock 'Em Robot, Mohammed Aliborg, went undefeated for 20 years before his head was knocked clean off by the sudden, brutal intervention of cats. Learn to sock like the best of 'em with today's Groupon. For $20, you get three cardio boxing classes from Polk Street Gym (a $40 value). Whack and thwack at its Lower Nob Hill castle of cardio. Though normal boxing combines a total-body workout with the pleasure of being repeatedly punched in the head, cardio boxing combines jump roping, shadowboxing, and pummeling heavy bags until they cry uncle. Each class will have participants blasting out pushups, sit-ups, and other fat-repelling, high-intensity exercises. With classes offered every day but Sunday, everyone from casual fitness goers to hardcore buffs can find time to squeeze in an hour-long routine. Arrive 1015 minutes before the scheduled time to reserve your spot, as each class is first-come, first-servedor last come, you got served. Owner Simon Redmond and his crew of experienced instructors learned boxing the hard way so you don't have to. They'll infuse years of in-the-ring experience into each sweat-extracting session. Varied exercises are designed to work every muscle from toe knuckles to the muscle that keeps hair firmly inside head tops. During the total-body workout, pick up authentic boxing skills that will leave you feeling simultaneously energized and exhausted once the multi-round routine comes to a close.
Seventy-five Yelpers award Polk Street Gym a perfect five-star average rating:
-   - Polk Street Gym is seriously amazing, life altering! Before walking into the gym I hadn't worked out for several months and had never taken a boxing class... The instructors were great though...very inviting, and willing to spend a bit of extra time on a novice like myself. Katherine S., Yelp, 8/12/2010
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