This will be a clinical trial of a standardized group exercise intervention, Les Mills Thrive, and determine if it alters muscle activation patterns and improves strength, balance, and symptoms in those with knee osteoarthritis (OA). Muscle activation patterns will be assessed using surface electromyography, strength will be assessed using isokinetic dynamometry, balance will be measured using the Community Balance and Mobility Scale (CB\&M), and symptoms and typical activity will be measured using two questionnaires: the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), and the Physical Activity Scale for the Elderly (PASE). These outcome measures will be measured at baseline and after a 12-week group exercise intervention (Les Mills Thrive) for 42 older adults with knee OA. Results of this study will be disseminated via a report to Les Mills International, in community presentations, at relevant academic (e.g. Osteoarthritis Research Society International (OARSI) annual conference) and industry (e.g. Medical Fitness Association annual meeting) conferences, in an academic journal publication (e.g. Arthritis Care \& Research), and through press releases or other media publications.
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Quadriceps amplitude (Quadriceps PC1)
Timeframe: From initial data collection to the end of treatment at 12 weeks
Quadriceps co-activation ( Quadriceps PC2)
Timeframe: From baseline data collection to the end of the intervention at 12 weeks.
Hamstrings amplitude (Hamstrings PC1)
Timeframe: From baseline data collection to the end of the intervention at 12 weeks.
Hamstrings co-activation (Hamstrings PC2)
Timeframe: From baseline data collection to the end of the intervention at 12 weeks.