During exercise, athletes should drink fluid at rates that a. exceed their sweat rates. b. are less than their sweat rates. c. are less than 0.5 liters per hour. d. most closely match their sweat rates.

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.