The purpose of this study was to determine the intensity of Nintendo Wii Fit games using indirect calorimetry. Twenty-five college students completed Wii Fit activity sessions at two difficulty levels within aerobics, strength, and yoga categories. Resting metabolic rate and exercise oxygen uptake were measured, and metabolic equivalents were calculated. Measured metabolic equivalents and calculated metabolic equivalents ranged from 2.30 [plus or minus] 0.42 and 2.44 [plus or minus] 0.38 for Yoga to 5.73 [plus or minus] 1.36 and 6.04 [plus or minus] 1.09 for aerobics, respectively. All selected Wii Fit activity intensities were significantly higher than resting, p less than 0.001; aerobic and strength activities met the moderate intensity threshold (three metabolic equivalents, p less than 0.001), while yoga activities did not (p less than 0.005). Aerobic and yoga activities of medium difficulty were more intense than the corresponding easy-rated activities (p less than 0.005). There were no statistical differences between measured and calculated metabolic equivalents. Wii Fit has potential as an effective tool for helping college-aged individuals increase their physical activity. (Contains 4 tables.)