We measured the basal metabolic rate (BMR), fat-free mass (FFM) and physical activity level (PAL) of well-trained bodybuilders as typical athletes with muscular development by resistance training in order to examine the standard BMR and PAL ranges for athletes. The subjects were 14 bodybuilders (mean±SD age: 36.8±9.1y.; height: 171.6±6.2cm; weight: 77.1±7.6kg; FFM: 67.6±6.8kg) who each trained for an average of 7.5h per week. BMR was measured by using a Douglas bag, the oxygen and carbon dioxide concentrations were analyzed by mass spectrometry, and FFM was measured by dual X-ray energy absorptiometry. PAL was measured by the doubly labeled water method for 7 subjects selected from the 14 bodybuilders. BMR/FFM was 25.4±2.1kcal/kg of FFM/day. Total energy expenditure (TEE) was 3, 432±634kcal, and PAL calculated as TEE divided by BMR was 2.00±0.21. The FFM value needs to be considered when evaluating a standard BMR range, and both training and daily physical activity levels should be considered when evaluating a standard PAL range.