The infographic says «Our body needs more electrolytes during the induction phase of the ketogenic diet.» (ketodietapp.com)
Sweat rate is highly variable between athletes, with some athletes losing up to 2.5 liters per hour (that's more than a large soda bottle) and others lose more electrolytes (the salty sweater).7, 8,9 With proper heat acclimatization, sweat rate will increase, but the concentration of electrolytes in the sweat will be less (i.e., less salty sweat). (blog.bridgeathletic.com)
During and after workouts, he drinks more electrolyte - infused water, and then has a post-workout protein shake. (inc.com)