Muscle building and Physical exercise

Muscle building noun - Exercise that builds muscles through tension.

Physical exercise and muscle building are semantically related. In some cases you can use "Physical exercise" instead a noun phrase "Muscle building".

Physical exercise noun - The activity of exerting your muscles in various ways to keep fit.

Muscle building and physical exercise are semantically related. Sometimes you can replace phrase "Muscle building" with "Physical exercise", this phrases are similar.