The correct answer is Option 4) i.e. No improvement​. Key Points Let's look at the meanings of the given options: turn down - to refuse or reject. put out - to extinguish. put up with - to tolerate. take over - assume control of something. According to the context of the given sentence, nobody will let go of a free exercise program. Hence from the given meanings, we find that turn down is the correct choice here. ​​​​Additional Information We should learn the words in a bunch if we want to enhance our vocabulary skills. Some phrasal verbs, with 'turn' as the main verb, are given below: turn off- to switch off or discourage turn out (to be)- to happen to be in the end turn up- to appear unexpectedly turn around- to make changes