Today's idiom is:
to work out.
The idiom "to work out" simply means "to do some exercise", usually at a gym or a health club.
Example 1
A: Do you want to go and get pizza with me?
B: No thanks! I've been working out and I don't want to spoil it.
Example 2
A: You've out on a lot of weight since the last time I saw you.
B: I know. I really should work out.
Native English proofreading and editing
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