Objectives: Determine the effect of an 8-week intervention of the new group fitness program Les Mills Pilates on balance, core stability, abdominal, back, and hip muscle endurance, flexibility, and mood. Research questions: Does doing Les Mills Pilates twice per week for 8 weeks result in: 1) increased balance, 2) increased core stability, 3) increased abdominal, back, and hip muscle endurance, 4) increased flexibility, and 5) improved mood? Intended outcomes: this study will determine the efficacy of a new group fitness program developed by Les Mills International. Results will be used to help refine the program, as well as in marketing of the program.

Inclusion Criteria:

• Not participating in regular core training (no more than 10 minutes per session, twice per week)
• Active (150 minutes per week of moderate to vigorous physical activity)

Exclusion Criteria:

• any neurological, cardiovascular, or musculoskeletal conditions that would put them at risk while participating, or be made worse by exercise
• Participants with current lower back pain
• Pregnant participants