Which statement best describes aerobic exercise?

• A. Use muscle tension with little movement
• B. Exert resistance at a steady speed
• C. Include rhythmic activities that use large muscle groups for an extended period
• D. Intense short bursts of energy

Answer: (C)

Aerobic exercise is sustained rhythmic movement that uses large muscle groups and relies on a steady supply of oxygen to meet energy demands. The statement describing rhythmic activities that use large muscle groups for an extended period fits this idea, since activities like brisk walking, running, cycling, and swimming keep the body moving in a steady, repetitive pattern for several minutes or longer, using the aerobic energy system.

Think of the other descriptions as describing different types of effort: holding a position with tension involves muscle force with little movement (isometric work), applying resistance while moving points to resistance training, and short, intense bursts correspond to anaerobic, high-intensity efforts like sprinting.