If maintained with care, the human body, or "brain car," is the best vehicle money can buy. Hone your two-legged chariot with today's Groupon for muscle-shaping, stamina-building triumphs of will. Today's Groupon to Fitness411 gets you four boot-camp classes for $25, a $63 value. Normally, Fitness411 only allows students to sign up for six-week sessions, but today's Groupon lets you try out four classes at your convenience, in case your flashy professional darts career makes it difficult to commit to anything...or anyone. Whether you want to work off your roast-beast guilt or test drive a potential New Year's resolution, Fitness411 will give you a challenging workout that will dust the cookie crumbs off your shoulder and give you the training to take the moves you learn home to practice on your own.Follow @Groupon_Says on Twitter.