There are muscle cars, and then there are cars that deliver you without hassle to the gym so you can build muscle. Consider these four new fuel-efficient rides the latter.

HONDA FIT With an athletic demeanor that belies its size and price, the Fit rides on a sophisticated suspension with high-tech electromechanical steering for nimble handling. A 1.5-liter four-cylinder engine delivers 109 horsepower and 33 mpg city/38 mpg highway. Already well equipped, a Sport model adds exterior styling effects and a steering-wheel paddle shifter for the optional five-speed automatic gearbox. $13,850; (800) 999-1009 or honda.com

NISSAN VERSA Available as a sedan or hatchback, Nissan's Versa is the most powerful of the current crop of micro-cars with its 122-horsepower 1.8-liter four-cylinder engine; still, it's rated at 30 mpg city/34 mpg highway. A choice of three transmissions includes a gearless CVT automatic. An Intelligent Key entry/starting system, Bluetooth wireless mobile-phone interface and Rockford Fosgate stereo are among its elective gadgetry. $12,450; (800) 647-7261 or nissandriven.com

CHEVROLET AVEO The subcompact Aveo is redesigned for 2007 with fresh styling and added refinement. Its 1.6-liter four-cylinder engine attains 103 horsepower and an estimated 27 mpg city/35 mpg highway. It's mated to either a five-speed manual or a four-speed automatic transmission, which will adapt to your driving style (aggressive, we assume). Standard features include side-impact airbags and an input jack for your iPod. $11,830; (800) 222-1020 or chevrolet.com

TOYOTA YARIS Its 106-horsepower 1.5-liter four-cylinder engine is rated at an impressive 34 mpg city/40 mpg highway, yet the Yaris remains an entertaining ride thanks to lively steering and suspension tuning. Side-curtain airbags are standard, and the (surprisingly roomy) hatchback offers a rear seat that slides, reclines and folds to emphasize comfort or cargo. $10,950; (800) 331-4331 or toyota.com