The activity that would MOST IMMEDIATELY rely on the lactic acid system is "Playing tennis at Wimbledon tennis tournament."
Tennis matches involve short bursts of high-intensity activity interspersed with brief rest periods, which leads to the body needing quick energy production. The lactic acid system (also known as anaerobic glycolysis) kicks in to provide energy during these intense efforts when the aerobic system cannot keep up with the demand for ATP (energy).
In contrast, swimming the English Channel and racing in the Tour de France are endurance events that rely more on the aerobic energy system over a prolonged period, which is less reliant on lactic acid production.
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