Which of the following is NOT a benefit of high intensity interval training?

High-intensity interval training (HIIT) is widely recognized for its numerous benefits, but one of those benefits is not an increased risk of injury. Instead, the other provided options highlight the positive impacts of HIIT on physical fitness and overall health.

Improved cardiovascular fitness is a well-documented outcome of HIIT. By alternating short bursts of intense exercise with recovery periods, participants can enhance their heart and lung capacity effectively in a shorter time than traditional steady-state cardio.

Enhanced muscle buffering capacity refers to the muscles' ability to handle lactic acid and other byproducts of strenuous exercise. HIIT encourages adaptations in the body that improve endurance and performance in high-intensity efforts.

Improved protein synthesis represents the body's ability to repair and build muscle tissues after exercise, a crucial factor in both strength training and overall fitness. HIIT can stimulate muscle growth and recovery, making this a notable benefit as well.

In contrast, while any form of exercise, including HIIT, does carry some risk of injury, this aspect does not align as a benefit and is often viewed as a consideration for safety rather than a positive outcome. Therefore, highlighting increased risk of injury is correct as it does not fit with the typical benefits associated with high-intensity interval training.