How long should you hold your stretches

The letter B is the right answer.

Explanation:

Stretching is a practice recommended for everyone, from sedentary to athletes, to improve flexibility. Even sedentary people should stretch, in order to reduce the overload on the joints during simple movements of the daily routine.

Stretching is an exercise aimed at gaining flexibility by stretching muscle fibers. As a result, the muscle moves away from one point to the other, in order to provide more agility and increase the range of muscle movement and elasticity. However, to achieve this goal it is necessary for the athlete to keep stretching for 15 seconds.

Stretching prepares the musculature to exercise any movement, without unnecessary tension. If your flexibility is poor, you should practice every day, including Saturdays, Sundays and holidays.

i'm pretty sure questions like these aren't allowd.   but, sure.   i can and talk : ))