America has always been the most extreme country, from the Boston Tea Punchings to having the first man swear on the moon. We hold this shredding guitar solo to be self-evident with today's Groupon: for $5, you get entrance to two bicycle-motocross practice sessions from Metro BMX, held Wednesdays from 6 p.m. to 8 p.m. at the Sam Lynn Ballpark Complex (a $10 value).

At Metro BMX's weekly bicycle-motocross practice sessions, seasoned BMX vets and neophytes alike hone their racing chops on a well-maintained dirt motocross track. Racers bring their own BMX bikes (without pegs) to the course for two hours of open ride practice, during which BMX'ers can train for future races, fine-tune their skills, and conquer one of the newest Olympic sports. Riders as young as 3 (with a parental waiver) and as old as 60 frequent Metro BMX, allowing for high-octane family bonding and cross-generational understanding without awkward rides through the park on a bicycle built for nine. Metro BMX encourages riders to bring along their own helmets, though loaner helmets are available at the track.