Each subject will participate in 4 follow-up test sessions after the initial intake; Pre-exercise session at the start of the study, Follow-up #1 at the mid-point of the study, Follow-up #2 at the end of the study and a Test-retest session during the no exercise phase of the study. Within the same week as completing the intake session, all subjects will complete the pre-exercise test session. All follow-up testing sessions will include: 1. Subjective evaluation of knee function via the Pedi-IKDC and Physical Activity Questionnaire for Children (PAQ-C), 2. Standardized warm-up on a stationary bike, 3. Dynamic balance evaluation using the SEBT and Y-Balance tests, 4. Strength testing using the Biodex isokinetic dynamometer and core stability tests, and 5. Knee laxity testing using the KT-1000. Both ACL-injured and healthy knee subjects will be randomly divided into two groups, Group A & B. The week following baseline testing, Group A will begin the 5-week NMT protocol, complete a follow-up #1 testing session, then receive no intervention for 5 weeks, and return for a follow-up #2 testing session. The week following baseline testing, Group B will receive of no intervention for 5 weeks, then complete a follow-up #1 test session, complete the 5-week NMT protocol and then return for a follow-up #2 testing session. The test-retest session will be conducted during the first week of the "No Exercise" phase.