Muscle building and Weightlifting

Muscle building noun - Exercise that builds muscles through tension.

Weightlifting and muscle building are semantically related. In some cases you can replace term "Weightlifting" with "Muscle building", this terms are similar.

Weightlifting noun - Bodybuilding by exercise that involves lifting weights.

Muscle building and weightlifting are semantically related. Sometimes you can use "Muscle building" instead a noun "Weightlifting".