The top three most efficient modes of human-powered transportation are (in no particular order): Flintstone cars, bicycles, and a palanquin carried by the various monarchs you've conquered and overthrown. Make sure the most feasible of these is in perfect working order with today's Groupon to Impala Bicycles, located in Richmond Hill and Whitby. Choose from the following options:

• For $39, you get a full bike tune-up (a $90.34 value, HST included).
• For $29, you get a basic tune-up (a $67.79 value, HST included).
• For $25, you get $50 worth of goods and services.

Impala Bicycles descends upon pedal-heavy pavement by pruning bicycles and satisfying cyclists. With the full bike tune-up ($90.34), wistful wheels undergo an adjustment of hubs, bottom brackets, nuts and bolts, brakes and gears, and neuroses. Impala's capable crew insists on a full safety inspection that covers tires, drivetrain condition, and bearings for adjustments and wear. Cables and chains marinate in a lubricant before wheels slip off and a cycle savant trues them to oblivion. The basic tune-up ($67.79) dips into similar territory but focuses on brake adjustment and pad alignment as gears, cables, pulleys, and limit screws sweat under the all-revealing glare of the inspector's interrogation lamps. Meanwhile, pre-tuned cyclists can dive helmet-first into Impala's vast stock of accessories and other services, bestowing frosty bikers with warm winter clothing or donning sturdy snowshoes to rescue two-wheelers from the grip of an abominable snowman.