Before revision: Stretching A group of High School girls performing a ballistic stretch in a Physical Education session Stretching is part of some warm-up routines, although a study in 2013 indicates that it weakens muscles in that situation.
After revision: UselessStretching A group of High School girls performing a ballistic stretch in a Physical Education session Stretching is part of some warm-up routines, although a study in 2013 indicates that it weakens muscles in that situation.