Stopping OsteoARthritis After an ACL Tear

Inclusion Criteria: * Currently live in British Columbia, Canada * 16-35 years of age (inclusive) * 9-36-months past a first-time ACLR performed ≤12-months of first-time ACL tear * Currently not receiving knee care from a health or fitness provider and have no scheduled surgical procedures (any part of the body) that would interfere with exercise during the study. * Score below a KOOS4 PASS (\<79 points) * Have daily access to an email address and a computer with internet * Are willing to wear an activity tracker during the study Exclusion Criteria: * Inability to communicate in English * No medical attention (healthcare provider) time-loss (missed physical activity, sport or work ≥2 occasions) injury to the ACLR knee before the ACL tear * Previous physician diagnosis of index knee osteoarthritis * Inflammatory arthritis or other systemic condition * Lower limb injury, surgery, or intra-articular injection in the past 6-months * Current pregnancy * MRI contraindications (i.e., Weight over 400 lbs (MRI machine limit); Pacemaker or any other implanted medical device (i.e., wires, defibrillator, artificial heart valve, an electronic device like a drug infusion pump, electrical stimulator for nerves or bones, coil, catheter, or filter in any blood vessel, ear or eye implant, or stainless steel intrauterine device (IUD); Brain or ferromagnetic aneurysm clip; any other metallic prostheses or shrapnel, bullets, or other metal fragments; injury where a piece of metal lodged in the eye or orbit, or; surgery, medical procedure or tattoos (including tattooed eyeliner) in the last 6 weeks).