In an effort to pump up you decide to hit the gym and lift, Ask an Expert

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In an effort to pump up you decide to hit the gym and lift weights everyday of the week. Your favorite lift, which you per-form every trip to the gym, is the bench press. This lift involves lifting a 125 lb. weight straight up from chest height to full arm extension, a distance of 20 inches. (a) How much work is done on the weight to lift it one time? (b) If you do 3 sets of 10 in a day, what total energy do you expend on lifting, assuming a typical efficiency for energy use by the body? (c) How many 400 Calorie jelly donuts can you eat each day to supply that energy?

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