If you need a bit of exercise tomorrow, you might consider entering the Beausoleil Stair Race.
Stair racing is a popular extreme sport in many countries, but usually takes place inside tall buildings or skyscrapers such as the Empire State Building in New York. Although we do have a number of these in Monaco, we prefer to do it in the open air. With 458 steps to run up, the equivalent of 30 floors, it's only advisable if you're already fit and exercise regularly. It makes us quite breathless just thinking about it.
There are plenty of alternatives for practicing sport in Monaco. And if you want to get out for a bit of fresh air and exercise there are many open spaces around for those who prefer a slower speed.