Final answer:
The two dangerous types of stretches are overstretching and ballistic stretching, which can lead to injuries such as strains and tendinitis. Proper stretching exercises, usually designed by a physical therapist, are crucial for recovery and injury prevention.
Step-by-step explanation:
The two generally dangerous kinds of stretches that can lead to injury when not performed correctly or without a proper warm-up are overstretching and ballistic stretching. Overstretching occurs when muscles are stretched beyond their capacity, which can lead to strains, commonly known as 'pulled muscles.' Ballistic stretching involves bouncing into a stretch, potentially causing harm, as it does not allow muscles to adjust to the lengthening process, contributing to potential strains or tendinitis.
Regarding strains and tendinitis, rest and cold compresses are often recommended treatment methods. However, stretching exercises prescribed by a physical therapist are pivotal for recovery and prevention of further injury. These stretches are designed to be safe and are tailored to each individual's needs.