Introduction: Field hockey is a contact sport. Semiflexion asymmetric position, along with other theories such as the weakness of the extensor muscles of the back or hamstring injury, can be causes or aggravating that suelan hockey players suffer back pain. Objectives: To observe the effectiveness of manual therapy techniques and post-isometric stretching (PNF) after three treatment sessions. In turn, know which of the two treatments have a greater benefit and longer. Methods: The population consists of grass hockey players and senior category aged between 16-30 years. They were randomly divided into two treatment groups. Group 1 corresponded to manual therapy techniques and group 2 to PNF stretching. The study duration for each subject was 5 sessions that included 3 treatment and 3 assessments. Each evaluation consisted of goniometry, balance test using the Sit and Reach, and Roland Morris questionnaire.

Inclusion Criteria:

• field hockey players (HH) (senior category).
• between 16 and 30 years.
• suffered injuries and microtraumatic not prevent them from sports.

Exclusion Criteria:

• subjects with structural abnormalities of the spine.
• plantar alterations.
• other moderate or severe musculoskeletal previous injuries in the last 6 months and prevented them make sport normally.