Question

Jason is a body builder. Despite being more fit, he weighs more than his brother Ryan, who is the same height. Which is a possible reason?

Answer 1

Because muscle weighs more than fat. So we have to assume Jason has more muscle in proportion to fat than brother Ryan even though they weigh the same.

Answer 2

One possible reason is because Jason has more muscle mass (from the body building). A pound of muscle takes up less volume than one pound of fat. This would contribute to Jason weighing more than Ryan, despite being more fit.