work out vs tone up

work out and tone up both are verbs.

Word	Noun	Adjective	Verb	Adverb
work out	No	No	Yes	No
tone up	No	No	Yes	No

As verbs, tone up is a hyponym of work out; that is, tone up is a word with a more specific, narrower meaning than work out:

Other hyponyms of work out include limber up, loosen up, warm up, train, tumble, strengthen, tone, press, weight-lift, weightlift.

work out (verb)	tone up (verb)
do physical exercise	give a healthy elasticity to
give a workout to
come up with
work out in detail
find the solution to (a problem or question) or understand the meaning of
make a mathematical calculation or computation
be calculated
happen in a certain way, leading to, producing, or resulting in a certain outcome, often well