Isometric Endurance Field-Based Tests
Biering-Sorensen test
	The test consists of assessing how many seconds the participant can keep the unsupported upper part of the body (from the upper border of the iliac crest) horizontal while placed prone with the buttocks and legs fixed to the table bench by three wide canvas straps, with the arms across the chest. The test is continued until the participant could no longer control his/her posture for a maximum of 240 s.
Prone isometric chest raise test
	The test consists of assessing how many seconds the participant can keep the sternum off the floor while placed prone with the arms along the body. A small pillow is placed under the iliac crest to decrease the lumbar lordosis. The subject is asked to maintain the position for as long as possible, not exceeding a 5 min time limit.
Prone double straight-leg raise test
	The test consists of assessing how many seconds the participant can keep both legs raised with the knees off the mat while placed prone with hips extended, the hands underneath the forehead and the arms perpendicular to the body. The test is continued until the participant can no longer maintain knee clearance.
Dynamic Endurance Field-Based Test
Dynamic extensor endurance test
	The test consists of assessing how many repetitions the participant can perform while placed prone with the unsupported upper part of the body (from the upper border of the iliac crest). The arms are positioned along the body and the buttocks and legs are fixed by three straps. With the spine kept straight, the subject is instructed to extend the trunk to neutral and then to lower the upper body 45 degrees. A repeated beat guided the subject to maintain a cadence of 25 repetitions per minute until exhaustion.