Criterion-related validity of sit-and-reach and modified sit-and-reach test for estimating hamstring flexibility in children and adolescents aged 617 years

1. Castro-Pinero, J.
2. Chillon, P.
3. Ortega, F.B.
4. Montesinos, J.L.
5. Sjostrom, M.
6. Ruiz, J.R.