The heart rate that's not measured, but calculated, is called the . target heart rate
maximum heart rate
resting heart rate
ATP heart rate

It’s the target heart rate! hope this helps!

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!