This group will undergo a PNF stretching on the hamstring muscles.

This group will undergo a SMR stretching on the hamstring muscles.

A PNF stretching protocol will be performed with each participant assuming a long sitting position on a plinth with the knee maintained as extended as possible. At this moment, the participant will be asked to perform a maximum isometric hamstring muscle contraction for 5 seconds followed by 5 seconds of relaxation and 20 seconds of stretching. The therapist will show the participant how to maintain this isometric contraction with the flexion of the hip and ankle. Each participant will undergo 4 repetitions of PNF stretching (30 seconds/rep).

Evaluated with a modified sit-and-reach test (MSR). The participants sit on the floor with their lower limbs stretched out and together, their backs and hips are supported against the wall (90° hip flexion), and the soles of their feet are placed against the edge of a box. Participants then extended their arms forward, placing the same hand on top of the other with both hands facing down. During this, they keep their backs against the wall. They then reach forward, sliding their hands along the measuring scale as far as possible without bending their knees

Measured using the Borg rating of perceived exertion scale (RPE). The participants will be asked at the end of the intervention to give a number from 1 to 10, where 1 is the easiest and 10 the hardest.