Goal: To determine how much I sweat during exercise. Studies show that humans lose, on average, from a few cups to a few pints of fluid through exercise [1].

Materials/Methods: We will attempt to keep the body a closed system by accounting for any mass-in, mass-out. Study will be conducted on the same day in order that temperature and humidity will not be a factor. Participant will begin the trial by weighing himself/herself, au naturale, on an off-the-shelf bathroom scale. This weight will be the "before" weight. After a set amount of exercise (to be determined by the researcher), participant will dry himself/herself off and be weighed again. Any water consumed during exercise will be tracked and added to the end result. The weight difference should be the amount of water weight lost, calculated using the density of water as 1.000 g/ml.

Limitations: Though weight difference is assumed to be water, sweat is not purely water [2] and therefore the density of sweat is slightly higher. Also, during exercise, weight can be lost through the following (not exclusively): exhaling lactic acid, accidents involving blood loss, burning of calories, and excessive farting during exercise. Participants will be asked not to pee or poop during the experiment, as that might confound the results.