A = Weight pre-exercise (kg)


B = Weight post-exercise (kg)


X = Weight of food & water brought (kg)


Y = Weight of remaining food & water post-exercise (kg)


P = Total fluid lost to urination (L)
(e.g. 0.3L for each urination)

T = Exercise duration (hours)

C = A - B = 0 kg
Z = X - Y = 0 kg

Sweat Rate = (C + Z - P) ÷ T = 0 L/hour