In order to stretch her hamstring muscle group, a college soccer player asks a partner to passively move her hip into flexion. After a 10 s stretch, the partner continues to move the leg further into hip flexion while the soccer player resists the movement. After 6 s, she relaxes and the partner further moves her leg into hip flexion. This type of stretching is referred to as?
1) Static stretching
2) Dynamic stretching
3) Ballistic stretching
4) Proprioceptive neuromuscular facilitation (PNF) stretching