Which type of exercise stress can be considered "ugly" and detrimental to health?

Improper exercise techniques leading to injury can be classified as "ugly" because they pose a significant risk to a person's health and well-being. When exercises are performed incorrectly, it can lead to a range of injuries, from acute issues like sprains and fractures to chronic problems like tendonitis and joint pain. Such injuries can not only hinder progress in physical fitness but may also require medical intervention and extended recovery periods.

In contrast, engaging in high-level competitive sports, while occasionally risky, is typically performed under strict guidelines and coaching environments that prioritize athlete safety. Sustained low-intensity exercise is generally considered beneficial for cardiovascular health and overall well-being, promoting endurance without the stress levels that can lead to injury. Routine physical activity without variation can lead to stagnation in fitness levels, but it does not inherently cause harm like improper techniques can. Thus, the most detrimental type of exercise stress is indeed linked to the incorrect execution of movements.