During her warm-up, diane moves her arms side to side for 12 repetitions, using gradual and controlled movements. this type of stretching is called static stretching dynamic stretching isostatic stretching ballistic stretching

Dynamic stretching

The type of stretching that Diane is doing is the dynamic stretching.

Basically, dynamic stretching is characterized by controlled, slow, calculated, and smooth movements. It is usually done in 10 up to 12 repetitions. Dynamic stretching effectively improves the body's mobility and flexibility. Some of the people who prefer dynamic stretching are athletes, physical therapists, coaches, and trainers.