Which factor may change the work-to-rest ratio for HIIT depending on training goals?

• A. Weather conditions.
• B. Goals such as endurance vs power.
• C. Time of day.
• D. The athlete's mood.

Answer: (B)

The work-to-rest ratio in HIIT is adjusted to match your training goal. If you’re aiming for endurance, you use longer work intervals at a challenging but sustainable intensity with relatively shorter rests to push the aerobic system, improve fatigue resistance, and enhance mitochondrial adaptations. If your goal is power or speed, you shorten the work bouts and allow longer rest so you can perform each interval close to maximal effort, supporting full phosphocreatine recovery and neuromuscular power development. Other factors like weather, time of day, or mood might affect how hard you feel the workout or how safe it feels, but they don’t drive the choice of ratio for the targeted adaptation.