Fill in the highly caffeinated fitness instructor's welcome speech by dragging the right rules into the sentences.

Welcome to the gym! Please remember that you mustn't drop the heavy weights on the floor, because the yoga class downstairs is trying to meditate. Also, relax! You don't have to run on the treadmill for an entire hour; a brisk 20-minute walk is perfectly fine for beginners!

Welcome to the gym! Please remember that you mustn't drop the heavy weights on the floor, because the yoga class downstairs is trying to meditate.

Mustn't is used when telling someone not to do something because it is a bad idea, against the rules, or disruptive.

Also, relax! You don't have to run on the treadmill for an entire hour; a brisk 20-minute walk is perfectly fine for beginners!

Don't have to means that an action is not required. You can choose to run for an hour, but it is not necessary.