Definition of rappel for English Language Learners : to move down a steep cliff, rock, etc., by pushing your feet against its surface and sliding down a rope RAPPEL Defined for Kids
How much water you need to drink to get the most benefits depends on your diet, exercise routine, health and weather. You can start by aiming for the basic recommended amount for adults, which is 8 to 12 cups a day, according to Clemson Cooperative Extension, and making adjustments as needed.
It really doesn't get much easier than that. So remember, half your body weight (pounds) in ounces is how much water you should be drinking each day, and if you're exercising and sweating profusely, add another liter of water with half a teaspoon of sea salt to ensure proper electrolyte replenishment.