The following sentence and phrases conceal related words. Can you spot them?

Battering ram
Hercules and the Hydra myth
Sports announcer
River Po undulates through northern Italy
Wait on the weather

Answers:

Hidden in each phrase or sentence is a unit of weight:

batterinG RAM
hercules and the hyDRA Myth
sports annOUNCEr
river PO UNDulates
waiT ON the weather