What type of exercise does not require oxygen for ATP production?

The type of exercise that does not require oxygen for ATP production is anaerobic exercise. Anaerobic exercise relies on energy sources stored in the muscles and involves short bursts of high-intensity activity. During such exercise, the body primarily taps into glucose through a process called anaerobic glycolysis, which occurs without oxygen and produces energy quickly for activities like sprinting or heavy lifting.

In contrast, aerobic exercise involves sustained activities, such as running or cycling, where oxygen is necessary for the metabolic processes that produce ATP over longer periods. Isometric and isokinetic exercises refer to muscle contractions that can be performed in various settings, but they can still rely on both aerobic and anaerobic systems. Thus, anaerobic exercise is distinguished by its ability to function without oxygen, making it the correct answer.