While Deen, who lives in Savannah, Ga., has cut out the sweet tea she routinely drank straight through to bedtime and taken up treadmill walking, she plans few changes on the air.

One group did high-intensity treadmill walking, walking at faster speeds but for a shorter duration of 30 minutes.

After lunch came the day's most rigorous exercise, 40 minutes of treadmill walking.

Much easier on sensitive joints like the knees and hips, treadmill walking and running surfaces are typically long, padded platforms that allow ample room for a long stride and comfortable, low-impact walk or jog without the harsh contact of a concrete surface.

Test between treadmill walking and open air walking.

Forget flat treadmill walking; crank up the incline and you'll jack up the calories burned, says Tommy Boone, an exercise physiologist at the College of St. Scholastica in Duluth, Minn.

Adding to the confusion are the myriad names given to different walking styles: race walking, pace walking, fitness walking, aerobic walking, power walking, rhythmic walking, treadmill walking and mall walking, among others.

In order to better understand exergaming's relationship with physical activity, laboratory studies have compared exergames to both traditional seated video games and other physical activities, for example, treadmill walking.

These young adults did however perceive playing Wii Fit to be more intense than treadmill walking.

Both younger and older adults rate exergaming as more enjoyable than inactive gaming and treadmill walking.