Assume John is an 18-year-old male who weighs 180 pounds and has 25 percent body fat. What is the recommended body weight at 15 percent body fat for John? List the steps that you use in your computation
What will be an ideal response?
The recommended body weight for John at 15 percent body fat is 158.8 lbs. Following are steps:
1. Determine the pounds of body weight that are fat (FW) by multiplying his body weight (BW) by the current percent fat (%F) expressed in decimal form (FW = BW x %F). 180 x 0.25 = 45 lbs.
2. Determine lean body mass (LBM) by subtracting the weight in fat from the total body weight (LBM = BW – FW). (Anything that is not fat must be part of the lean component.) 180 – 45 = 135 lbs.
3. Desired body fat percentage (DFP) = 15%
4. Compute recommended body weight (RBW) according to the formula RBW = LBM ? (1.0 – DFP). 135 ? (1.0 – 0.15) = 158.8 lbs.
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