1lb is equivalent to about 3.5 iPhones. For a 140lb, 30 year old female to lose 1lb, she needs to do 471 minutes of aerobics or play guitar for 1041 minutes. Alternatively, reducing spaghetti intake by 11 cups per week and doing 236 minutes of aerobics can help lose 1lb, the equivalent of 3.5 iPhones.