Hamstring strain (HAM) and anterior cruciate ligament (ACL) injuries are, respectively, the most prevalent (25) and serious (29) noncon- tact occurring injuries in team sports. Several preventive programs involving jumps, strength, unstable, or a combination of different exercise modes have been pro- posed to prevent both ACL and HAM injuries (19).Understanding mechanisms underlying these injuries is crucial for choosing suitable approach to develop effective preventive protocols. Noncontact ACL injuries are likely to happen during deceleration and acceleration motions with excessive quadriceps contraction and reduced hamstrings co-contraction at or near full knee extension (28). The ACL loading is also increased when a valgus load is combined with an internal rotation of knee that increases lateral com- pression. This compressive load combines with anterior force vector produced by quadriceps contraction, resulting in ACL rupture (15). Furthermore, most of the HAM occurs when hamstrings are actively lengthening beyond their upright length (i.e., hip and knee at 08 flexion) to decelerate the forward movement of the tibia during the terminal swing phase of the sprint cycle (32). Based on the above described mechanisms, Monajati et al. (19) identified 7 modifiable risk factors associated with the incidence of ACL and HAM injuries: (a) knee valgus/varus angle and moment; (b) hip adduction/abduction angle and moment; (c) knee and hip rotation angle; (d) knee and hip flexion angle; (e) hamstring and quadriceps muscle strength; (f ) hamstring-to-quadriceps (H–Q) conventional and functional strength ratios; and (g) the angle at which the optimal knee flexor peak torque