Final answer:
The four popular stretching techniques for exercise are ballistic, proprioceptive neuromuscular facilitation (PNF), static, and dynamic. Passive stretching is not one of them.
Step-by-step explanation:
Stretching is very important in preventing injuries, reducing muscle tension, and promoting flexibility. The four popular stretching techniques for exercise are: ballistic, proprioceptive neuromuscular facilitation (PNF), static, and dynamic. Passive stretching is not one of the four popular stretching techniques for exercise. Passive stretching is when an external force, such as a partner or a stretching aid, is used to move a joint through the range of motion.